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1. Find the pH at each of the following points in the titration of 50 mL of 0.3 M HF with 0.3 M NaOH. The ka value is 6.6×10-4.
1. 1 answer
2. 43 views
Find the pH at each of the following points in the titration of 50 mL of 0.3 M HF with 0.3 M NaOH. The ka value is 6.6×10−4 .
1. 1 answer
2. 45 views
The pH of an aqueous solution that is 3.00% HCl by mass and has a density of 1.015 g/mL?* 2 points 0.078 4.5 7.8 0.78
1. 1 answer
2. 80 views
A 0.750 g sample containing only KCl and NaBr was titrated with 0.1043 M AgNO3 , requiring 42.23 mL to reach the endpoint.
1. 1 answer
2. 77 views
In titrations curve of a weak acid, at the equivalence point of the solution contains only of* 1 point The conjugate acid buffer
1. 1 answer
2. 55 views
The pH of a solution when adding 25.00 mL of 0.001 M NaOH on of 50.00 mL of 0.001 M acetic acid (HOAc) at 25°C is............*
1. 1 answer
2. 51 views
Calculate the pH of a solution when adding 30.00 mL of 0.1000 M NaOH on 50.00 ml of 0.0500 M HCl with at 25°C.* 1 point 11.80
1. 1 answer
2. 57 views
The human eye is not very sensitive to color differences in a solution containing a mixture of HIn and In-, particularly when
1. 1 answer
2. 57 views
An acid/base indicator is a weak organic acid or a weak organic base whose undissociated form differs in color from its
1. 1 answer
2. 77 views
How many millimoles of solute are contained in 250 ml of a solution that contains 4.20 ppm of CuSO4?* 1 point 0.00658 mmol 10.0
1. 1 answer
2. 108 views
how many grams needs to the preparation of 1.000 L of 0.0500 M AgNO3 (169.87 g/mol) from the primary-standard-grade solid.* 1
1. 1 answer
2. 46 views
How many grams of Ba(IO3)2 ( 487g/mol) can be dissolved in 250 ml of water at 25 C? Ksp = 1.57 * 10-9* 1 point 0.089 g 0.178 g
1. 1 answer
2. 45 views
Calculate the pOH of 0.200 M aqueous NaOH at 25°C.* 1 point 6 0.699 8 13.3
1. 1 answer
2. 42 views
The role of nitric acid ( HNO3) in gravimetric analysis is:* 1 point prevent peptizing use as washing ion exchange all of
1. 1 answer
2. 46 views
A sample containing 0.2784 grams of sodium chloride (NaCl) and 0.5486 grams of magnesium chloride (MgCl2). The chloride in the
1. 1 answer
2. 85 views
Adding precipitating agent slowly and stirring increases Q and decreases S* 1 point False True
1. 1 answer
2. 38 views
When (Q -S)/S is small, the precipitate tends to be a crystalline solid .* 1 point True False
1. 1 answer
2. 48 views
The effect of a constant error becomes more serious as the size of the quantity measured decreases.* 1 point False True
1. 1 answer
2. 54 views
Describe the preparation of 500 mL of 47.5% (w/v) aqueous ethanol (C2H5OH, 46.1 g/mol) .* 1 point 2.38 10-1 g C2 H5 OH 2.3.8 g
1. 1 answer
2. 48 views
A solution was prepared by dissolving 1210 mg of K3Fe(CN)6 (329.2 g/mol) in sufficient water to give 577 mL. Calculate the molar
1. 1 answer
2. 65 views
Calculate the molar H3O+ ion concentration of a solution that has a pH of 5.31.* 1 point 4.9 × 10–5 M 4.9 × 10–4 M 9.4 ×
1. 1 answer
2. 58 views
What is the mass in milligrams of solute in 5.75 mL of 0.0819 M KNO3?* 1 point 57.6 mg KNO3 47.6 g KNO3 47.6 mg KNO3
1. 1 answer
2. 75 views
9.00 L of a solution that is 60.0 ppm in Na+, starting with solid Na2SO4* 1 point Dissolve 1.7 g Na2SO4 in enough water to give
1. 1 answer
2. 69 views
A writer of a persuasive text should address conflicting personal views and evidence by first trying to either back up their own
1. 1 answer
2. 197 views
Which equation can be used to determine the price, p, of one game?a. 45. 90p = 3 b. 3p = 45. 90 c. p/3 = 45. 90 d. p/45.90 = 3
1. 2 answers
2. 322 views
The usefulness of science
1. 2 answers
2. 267 views
Explain the usefulness of science
1. 2 answers
2. 260 views
A pond is 36 m long a duck swims 4 lengths of the pond each day how far does the duck swim in four weeks
1. 1 answer
2. 642 views
Given the measured cell potential, E cell is -0.3603 V at 25°C in the following cell, calculate the H+ concentrationPt(s)|H2(g,
1. 0 answers
2. 1,143 views
A(aq) <--> 2B(aq)Kc= 5.98 * 10^-6 at 500 K If a 2.30 M sample of A is heated to 500 K, what is the concentration of B at
1. 0 answers
2. 757 views
A centrifuge is a device in which a small container of material is rotated at a high speed on a circular path. Such a device is
1. 0 answers
2. 724 views
The centrifuge is a device in which a small container of material is rotated at a high speed on a circular path. Such a device
1. 0 answers
2. 678 views
A centrifuge is a device in which a small container of material is rotated at a high speed on a circular path. Such a device is
1. 1 answer
2. 747 views
the half-life of rhodium rh-106 is about 30 seconds. you start with 500 grams.formula: y=ab^x
1. 3 answers
2. 3,003 views
Simplify.3ab^2/4ab * 3a^2 b4a
1. 1 answer
2. 723 views
When 2-propanol was used as the developing solvent, two substances moved with the solvent front (Rf = 1) during TLC analysis on
1. 1 answer
2. 1,600 views
A solution contains I-, Br- and OH- ions. If Ag+ is added, what will the precipitate(s) be?
1. 3 answers
2. 2,271 views
Simplify each polynomial.6g + 8k - 9g + 2k
1. 49 answers
2. 7,949 views
A florist sold bouquet of red roses to 15 of the first 20 customers who came into his shop.1. What is the experimental
1. 2 answers
2. 3,755 views
A florist sold bouquet of red roses to 15 of the first 20 customers who came into his shop.1. What is the experimental
1. 1 answer
2. 763 views
3m/2/3=7 can someone help me with this question.
1. 1 answer
2. 324 views
3m/2/3=7 How can I solve this problem? I need your help
1. 2 answers
2. 1,012 views
Amman hikes 2 3/4 miles of nature trail in 1 hour and 15 minutes. How many miles of trail does Amman hike per hour?
1. 1 answer
2. 661 views
The variables p and q have the same numerical value but the opposite sign; that is, one is positive and the other is negative.
1. 1 answer
2. 550 views
A deep-sea exploring ship is pulling up a diver at the rate of 25 feet per minute. The diver is 200 feet below sea level. How
1. 15 answers
2. 7,020 views
An elevator is on the twentieth floor. It goes down 11 floors and then up 5 floors. What floor is the elevator on now?
1. 6 answers
2. 2,984 views
When Steve woke up. His temperature was 102 degrees Fahrenheit. Two hours later it was 3 degrees lower. What was his temperature
1. 2 answers
2. 1,748 views
What's the missing number?5+3-6-8+4-?= -9
1. 0 answers
2. 438 views
A basketball rolls to the right with a velocity of 4 meters per second. It is pushed up and accelerated up for 2 seconds with an
1. 1 answer
2. 555 views
8g of hydrogen is burnt in the presence of excess oxygen.the mass of water formed is?
1. 2 answers
2. 926 views
76 times a number minus 72 equals to -65 less than a number
1. 1 answer
2. 873 views
S is in the interior of ∠PQR, m∠PQS = 87°, and m∠SQR = 33°. Find m∠PQR.
1. 1 answer
2. 2,697 views
Which list shows the pattern you would get if you used the rule 12n?A. 12,14,16,18 B. 12,24,36,48 C. 12,13,14,15 D. 12, 22,
1. 4 answers
2. 2,967 views
Joy put 6 photos on each page of her album. When she was done , she had 2 pictures left over. She put 38 pictures in the album.
1. 4 answers
2. 2,735 views
a person who is 6 feet tall is standing 108 feet from the base of the tree, and the tree cast a 120 foot shadow . The person's
1. 3 answers
2. 1,914 views
Lily made 3 pounds of cloe slaw for a picnic .Each serving of cole slaw is 1/8 pound.How many 1/8 pounds servings of Coles slaw
1. 4 answers
2. 1,246 views
A male African elephant weighs 7 Tons. If a male African lion at the local zoo weighs 1/40 of the weight of the male African
1. 17 answers
2. 3,181 views
Eddie measured his aquarium using a small fish food box. The box has a base area of 6 inches and a height of 4 inches. Eddie
1. 12 answers
2. 1,503 views
A mail truck picks up two boxes of mail from the post office. The total weight of the boxes is 32 pounds. One box is 8 pounds
1. 5 answers
2. 1,418 views
If you divide this mystery number by 4, add 8, and multiply by 3 you get 42. What is the mystery number?
1. 1 answer
2. 1,296 views
Maurice lives 4 miles east of Drew. Chris lives 1 mile east of Maurice. Randy lives 2 miles east of Drew. Everyone lives on the
1. 1 answer
2. 526 views
Wendy is building a set for a school play. She is putting up a fence around a rectangular plot of fake grass measuring 3 feet by
1. 1 answer
2. 596 views
Wendy is building a set for a school play. she is putting up a fence around a rectangular plot of fake grass measuring 3 feet by
1. 1 answer
2. 516 views
Maurice lives 4 miles east of Drew. Chris lives 1 mile east of Maurice. Randy lives 2 miles east of Drew. Everybody lives on the
1. 1 answer
2. 568 views
What are the classification of a Emerald Rock?
1. 0 answers
2. 497 views
Polar ice is about 3/4 of the 3% of Earth's fresh water. What fraction of all of Earth's water is polar ice?
1. 3 answers
2. 553 views
How do you change 97% into a fraction?
1. 1 answer
2. 674 views
[Key: /= a fraction bar]Olga ran 5 kilometers in 37 minutes. Which could Olga use to determine m, the number of minutes she
1. 15 answers
2. 1,891 views
Find the product14.4/5 of 30 A. 24 B. 8 C.30 4/5 D.20 15. 14 * 3/5 A.42 B. 20 C. 8 2/5 D.28 3/5 16. 3/10 * 2/10 A.3/50 B. 1/10
1. 5 answers
2. 477 views
Kevin had 3/4 yd of string. He used 1/3 of it on a school project. How much string did he use?A.5/12 yd B.1/3 yd C.7/12 yd D.1/4
1. 7 answers
2. 2,677 views
Which sequence of process must occur for an atom of carbon to go from a car to a tree?A. respiration, decomposition B.
1. 3 answers
2. 862 views
A restaurant sells about 330 sandwiches each day at aprice of $6 each. For each $.25 decrease in price, 15 more sandwiches are
1. 1 answer
2. 1,085 views
Two forces are applied simultaneously to a crate sliding in a horizontal plane: 36.8 N to the right and 20.2 N to the left. What
1. 1 answer
2. 540 views
Marla and her mom cooked 21.3 liters of spaghetti sauce. They used 18 jars of the same size to can it. About how much did each
1. 1 answer
2. 564 views
Anthony leaves kingstons at 2:00 pm and drives to queensville, 160mi distant, at 45 mph. At 2:15 pm Helen leaves queensville and
1. 1 answer
2. 2,269 views
A homeowner wishes to fence in three adjoining garden plots, as shown in the figure. If each plot is to be 80 ft^2 in area, and
1. 5 answers
2. 5,284 views
Abbie paints twice as fast as Beth and three times as fast as Cathie. If it takes 60 min to paint a living room with all three
1. 1 answer
2. 1,673 views
1.50g of NaHCO3 is dissolved in 17.1g of water. Express the solubility of NaHCO3 in grams per 100g of solvent and calculate the
1. 1 answer
2. 867 views
Accounting 1 Help!1. An accountant records a transaction when cash is paid or received under which basis of accounting? cash
1. 1 answer
2. 1,881 views
4 1/3 - 21/2
1. 3 answers
2. 418 views
4 1/3 - 2 1/2 Thank you for your help
1. 1 answer
2. 443 views
3 1/10 + 14 2/5
1. 2 answers
2. 428 views
4 2/9 + 2 1/3
1. 1 answer
2. 412 views
7/12, 3/4, and 2/3 in order which one is the smallest to the greatest?
1. 2 answers
2. 504 views
Is 2/3 greater than 3/4
1. 1 answer
2. 516 views
Vicki bought an ice cream cake cut into 6 equal pieces. Vicki, Margo,and Elena each took 2 pieces of the cake home. Vicki says
1. 2 answers
2. 841 views
A greenhouse at Alice's nursery has 340 planters. Each planter holds 10 plants. Alice has 1,092 plants in the greenhouse. How
1. 1 answer
2. 576 views
1/6 of a box of paperclips are red, 5/12 of them are blue and 2/5 of the remainder are black. If there are 10 black paperclips,
1. 1 answer
2. 798 views
Javier rode his bike for a total of 41 minutes. Before lunch, he rode for 1 minute less than 5 times the number of minutes he
1. 7 answers
2. 2,685 views
Together , Tom and max have 72 football cards. Tom has 2 more than 4 times as many cards as max has. How many football cards
1. 2 answers
2. 1,363 views
the sum of 5 consecutive whole numbers is 2005. what is the sum of all the digits of these 5 numbers
1. 4 answers
2. 2,642 views
Richard's Plumbing Co. has rapidly grown to become a multi-state business, and it has recently acquired Mr. Plumber, a smaller
1. 0 answers
2. 1,029 views
Can someone please help me start this?Using Shannon’s formula, calculate the data transfer rate given the following
1. 0 answers
2. 592 views
Find all numbers x for which |x-1| + |x-2| > 1.I know the answer is that there exists no such x, but I need someone to explain
1. 2 answers
2. 413 views
Find all numbers x for which |x-1| + |x-2| > 1.I know the answer is that there exists no such x, but I need someone to explain
1. 0 answers
2. 392 views
The region bounded by y= 1/(x^2+2x+5), y=0, x=0, and x=1, is revolved about the x-axis. Find the volume of the resulting solid.
1. 1 answer
2. 515 views
How do you work5y ____ 3y+6 It is in fraction form and it just got me stuck,,,please help!!!!! :(
1. 4 answers
2. 423 views
if 25% of all students asked say they spend too much time on homework, and 12 students are selected at random, what is the
1. 1 answer
2. 610 views
How many grams of SO2 can be produced from 100g of S and excess O2
1. 2 answers
2. 2,161 views
If I have a Galvanic cell of Nickel and Gold where Nickel is (Ni->Ni^+2 + 2e-) and the oxidation of gold is (Ag^+->Ag + e-) then
1. 1 answer
2. 926 views

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