sea lively

This page lists questions and answers that were posted by visitors named sea lively.

Questions

The following questions were asked by visitors named sea lively.

Hydrogen iodide decomposes according to the following equation: H2(g) + I2(g) ⇌ 2HI(g) A 2.50 L equilibrium mixture contains 0.0875 mol H2, 0.020 mol I2, and 3.72 mol HI. Determine the new equilibrium concentrations after 1.25 mol HI are added to the syst...

7 years ago

An antacid tablet contains the weak base Mg(OH)2. After crushing the tablet and adding 20.00 mL of 1.00 M HCl(aq) to it, the remaining acid is titrated to the end point with 29.50 mL of 0.495 M NaOH. How many milligrams of Mg(OH)2 were present in the tabl...

7 years ago

How many Ml of 0.200 M NaOH are needed to neutralize 15.00 mL of the 0.100 M hypothetical acid H2A?

7 years ago

If 0.314g sample of a solid monoprotic acid were dissolved in water and titrated to an end point that required 44.2 mL of 0.115M NaOH, what is the molecular mass of the unknown acid?

7 years ago

Determine the equilibrium constant for a 0.10M phenol (HC6H5O) solution that has a pH of 5.43 at 25 degrees C. What is the degree of ionization of this weak acid? Why is the pH value important for this problem?

7 years ago

When one half teaspoon of baking soda is dissolved in your stomach, what volume of carbon dioxide gas would be produced at body temperature and 1.00 atm. pressure? On the average, one half teaspoon of baking soda contains 2.40 g of sodium bicarbonate. Ass...

7 years ago

a) If 2.40 g NaHCO3 is added to 150 mL of 0.200 M HCl, calculate the molarity of H+ after the reaction above goes to completion. b) What volume, in mL, of 0.900 M KOH would be required to neautralize the remaining HCl in the problem above?

7 years ago

What would the pH of the solution be if the salt NaHX is dissolved in water? What anion predominates at the first equivalence point of the titration of X^2- with H^+?

7 years ago

If 35.00 mL of 0.25 M NaOH(aq) is mixed w/ 20.00 mL of 0.400 M HClO4(aq), the result solution would be: So apparently the correct answer is BASIC, but I thought it would be neutral because the resulting solution would contain NaClO4 which has components o...

7 years ago

A solution contains 0.010 M BaCl2. Calculate the molarity of the ions in solution, the ionic strength of the solution, the activity coefficient of the barium ion and its activity. Repeat for the chloride ion. Show all calculations please.

7 years ago

Consider the titration of 10.00 mL of a 0.250 M aqueous solution of ethylenediamine (H2NCH2CH2NH2) with 0.250 M HCl(aq). pKb1 = 4.07 and pKb2 = 7.15. What is the pH of the ethylenediamine solution prior to the start of the titration?

7 years ago

Consider the titration of 10.00 mL of a 0.250 M aqueous solution of ethylenediamine (H2NCH2CH2NH2) with 0.250 M HCl(aq). pKb1 = 4.07 and pKb2 = 7.15. What is the pH of the solution after 7.50 mL of HCl are added?

7 years ago

The solubility of lead (II) chloride in water is 4.50 g/L at 25 degrees C a. What is the molarity of Pb2+ in a saturated solution b. What is the molarity of Cl- in the solution in the previous problem c. What is the equilibrium constant for the reaction:...

7 years ago

When K is measured for a reaction, the values obtained are 3.1 at 25°C and 7.42 at 35°C. Using the equation lnK=-(∆H°/R)(1/T)+(∆S°/R) (in the form y=mx+b) calculate ∆H° and ∆S° for the reaction PbCl2(s) --> Pb2+(aq) + Cl-(aq)

7 years ago

Would your calculated Ksp value be greater, less, or the same, if the following occurred, please explain your reasoning. a. The CaSO4 was not saturated b. You accurately measured 20.00 mL instead of 25.00 mL using a pipet c. The CaSO4 solution contained 1...

7 years ago

Only 0.0640 grams of PbF2 will dissolve in 100.0 mL of solution. From this data, calculate the Ksp by two methods.

7 years ago

Draw a cell diagram to show how you could determine the Kf of [Ni(NH3)5]^2+ using electrochemical cells.

7 years ago

From the following reduction potentials, determine the reduction potential of SN^4+ + 4e^- --> Sn^o SN^2+ + 2e^- --> Sn^o | -0.135V SN^4+ + 2e^- --> Sn^2+ | -0.15V

7 years ago

Consider the following electrochemical cell: Pt(s) | Hg2^2+ (0.800M) || MnO4^- (0.650M), H^+ (1.00M), Mn^2+ (0.375M) | Pt(s)

7 years ago

A ball is rolling with an initial velocity of 5.55 m/s over a table moves over the edge and falls to the ground. How long is the ball in the air when the table is 1.11m high. a. How long is the ball in the air before it hits the ground? b. How far from th...

7 years ago

A ball within an initial velocity of 5.55 m/s is shot at an angle of 30 degree above the horizontal using a launcher. The launcher is 1.11 high. a. How long is the ball in the air, before it hits the ground? b. How far from the launcher does the ball land...

7 years ago

A ski jump's velocity can be calculated (assume no friction). The tower is 60.0m high and the skier is at the bottom, who will leave the jump under a 21 degree angleto the horizontal, and land 33m below the starting point. The skier has the exact same vel...

7 years ago

A girl is pushing a box with constant velocity through her room. Draw a free body diagram for the box and a-t, v-t, x-t diagrams. No numbers necessary, but the trend.

7 years ago

Now 3 girls are pushing the box each with the same force. Draw a free body diagram for the box and a-t, v-t, x-t diagrams.

7 years ago

An object moves in a straight line at a constant speed. Is it true that here must be no forces of any kind acting on this object? Explain.

6 years ago

Provide an example for an object that experiences each of the following: A. An object with zero velocity and zero acceleration B. An object with non-zero velocity and zero acceleration C. An object with zero velocity and non-zero acceleration D. An object...

6 years ago

Block A with mass 4.0 kg, sits on a friction less table. Block B, with mass 2.0 kg, hangs down from a rope connected through a pulley to block A. What is the acceleration of block A?

6 years ago

Assume there is a large frictional force acting on the cart (coefficients of friction 𝜇𝑆 = 0.4 and 𝜇𝑘 = 0.15), and the total mass 𝑀 = 𝑚1 + 𝑚2 = 0.65𝑘𝑔. a. Find the equation for the acceleration of the cart in terms of 𝜇𝑘, the masses, and g – assuming that...

6 years ago

Answers

The following answers were posted by visitors named sea lively.

Your answer will contain 1 significant figures. That will be 0.3

7 years ago

It will only have one significant figure. Therefore it will be 60

7 years ago

Isn't there supposed to be an equilibrium arrow in the chemical equation?

7 years ago

Why are we dividing mols HCl by 2?

7 years ago

This is what I got: 20.00 mL / 1000 mL * 1.00 mol = 0.0200 mol HCl (initially added) 29.50 mL / 1000 mL * 0.495 mol + 0.0146 mol NaOH (used) 0.0200 mol HCl - 0.0146 mol NaOH = 0.0054 mol HCl (used) 0.0054 mol HCl / 2 mol HCl * 58.33 g * 1000 mg = 160 mg (...

7 years ago

Okay, now I understand. So is my answer's correct?

7 years ago

Ok Thanks!

7 years ago

what is the total volume that i should use. which value given?

7 years ago

nevermind, i got it. now the second part, how do i start?

7 years ago

i dont understand where to start though

7 years ago

So that means it would be neutral only if there was an equal amount of both NaOH and HClO4, correct?

7 years ago

Okay, so I got a pH of 11.7, is that correct?

7 years ago

i'm still confused though. Wouldn't you multiply L of ethylenediamine by its M before plugging that into the ICE table?

7 years ago

Thank you, I still have a few more parts related to this specific problem. Do you want me to add onto this forum or start a new question for each part?

7 years ago

0.00250 mol H2NCH2CH2NH2 0.001875 mol HCl =0.000625 mol H2NCH2CH2 excess now what? What do I plug into the HH equation?

7 years ago

What do you mean by reaching the first equilibrium point? Can I just plug the number I get by subtracting 4.07 from 14 into the HH equation?

7 years ago

i didnt mean to post that ^ twice....

Actually, i'm kind of second guessing your post. It doesn't look right to me. I just can't point my finger at it....

7 years ago

How about the activities, how do I solve those?

7 years ago

is the concentration from the ionic strength value or from the molarity of ions?

7 years ago

how can i find the activity coefficients?

7 years ago

Ksp=produts molarity/reatants molarity

7 years ago

okay what about the others?

7 years ago

Using the half-reaction method, write a balanced chemical equation for the electrochemical cell

does that mean it will just be a graph on an x-y plane??

7 years ago

so a vs t will be a straight line through the x axis? what about v vs t? in x vs t, is it a positive or negative slope?

7 years ago