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Questions (24)

If the Ksp of Zn (CN)2 (s) is 3×10^-16, what percentage of Zn2+ is precipitated when we know that[Zn 2+]=0.36M [CN-]=5×10^-3M
1. 4 answers
2. 544 views
Calculate the PH value of 1.00 L of a solution prepared by mixture of 1.00 mol HCl, 2.00 moles of NaOH and 1.50 moles of NH4ClKb
1. 0 answers
2. 461 views
Find a pH of a 0.100 M solution of the weak acid HA. The pKa for the acid 5.0
1. 1 answer
2. 762 views
During electrolysis of an aqueous NaOH solution in the anode, 2.8 L of Oxygen are released (under conditions considered normal).
1. 1 answer
2. 590 views
A W element that is in the IIA family combines with a Y element in the VIIA family and results in an ionic compound whose only
1. 1 answer
2. 518 views
In a reaction of ammonia production (NH3), 360g of nitrogen gas (N2) was reacted, generating a yield of 20%. What was the mass
1. 1 answer
2. 441 views
Nitromethane (ch3no2) burns in air to produce significant amounts of heat. 2ch3no2(l)+3/2o2(g)→2co2(g)+3h2o(l)+n2(g) δhorxn =
1. 1 answer
2. 1,112 views
What is the concentration of a potassium iodate solution after you complete the following porcedure? Pipette 10 mL of a 0.31 M
1. 1 answer
2. 1,052 views
One mole of aluminum chloride (AlCl3), 26.98 grams of aluminum (Al), and 106.4 grams of chlorine (Cl). What is the percent
1. 1 answer
2. 3,033 views
a 5.29 g sample of impure sodiun chloride was dissolved and dihuted to a total volume of 250 0 ml. If 25.0 mL of the sodium
1. 0 answers
2. 483 views
Determine the number of moles of calcium carbonate with 10% impurities, which reacts with 21.9 g of hydrochloric acid.
1. 0 answers
2. 418 views
A 10 ml of hydrochloric acid solution of concentration equal to 0.1 mol per litre is added 90 ml of pure water. What's the pH of
1. 1 answer
2. 713 views
A 0.01 M solution of a HBrO is 4.0% ionized. is the PH value of this acid? (Log4 = 0.6)
1. 0 answers
2. 453 views
n order to determine the concentration of bivalent nickel in environmental samples we can use the complexometric titration. A
1. 1 answer
2. 543 views
Calculate the amount of hydrogen atoms in 0.75 mol of water molecules
1. 1 answer
2. 1,004 views
A solution was prepared with 100 ml of 0.1 mol/L acetic acid and 100 ml of 0.1 mol/l sodium acetate. The density of acetic acid
1. 1 answer
2. 643 views
Calculate the oxalic acid mass required for neutralization of 25 ML of 0.1 M NaOH solution.Dihydrate Organic Diacid (H2C2O4.2
1. 1 answer
2. 972 views
Consider the titration of 20.00 ML of KOH 0.01 mol/L with HNO3 0.01 mol/L. Calculate the PH of the titration solution after the
1. 2 answers
2. 791 views
Calcium carbonate and sulfuric acid react according to the balanced reaction.CaCO3+ H2SO4 = CaSO4 + CO2 + H2O Starting from 300
1. 2 answers
2. 1,337 views
What is the volume of solvent needed for the preparation of an equal 10% title solution when using 15 mL of solute?
1. 3 answers
2. 431 views
A galvanic cell with e o cell = 0.30 v can be constructed using an iron electrode in a 1.0 m fe(no3)2 solution, and either a tin
1. 1 answer
2. 2,154 views
A chemist added 3.15 grams of HNO3 to a solution of the same acid with concentration of 9 mol/L. dilutes the resulting solution
1. 1 answer
2. 585 views
You have a 250ppm solution of K with KCl, you want to prepare a 0.00100 mole of Cl, how many mililiter should be diluted to
1. 3 answers
2. 1,718 views
How many electrons contain the ion that has 13 protons 10 electrons and 15 neutrons?
1. 1 answer
2. 590 views

Answers (4)

thank you so much :)))
0.97% ??
thank u
why do we have to take the pssa

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