Chemistry Answers

When sodium chloride reacts with a silver nitrate silver chloride precipitates what mass of a AgCl it’s produce from 75.0 g of AgNO₃

1.   How many grams of Copper Sulphate Pentahydrate (CuSO₄.5H₂O) are needed to prepare a 500 ml of 4% CuSO₄ solution?

If the pOH of an aqueous NaOH solution is 11.55, what is the [H₃O⁺] for this solution?

For the reaction 2O (g) ⇌ O2 (g), it has an equilibrium constant (K) of 1.5.

a) If at a certain time, the concentration of O is [O] = 0.5M and concentration of O2 is

[O2] = 0.8M, what is the reaction quotient (Q)?

b) Based on your answer in part a, will the reaction proceed forward or reverse? Why?

What is the pH of a 0.02M solution of HCl?

The solubility product (Ksp) is 0.005 for the reaction below,

Ba (OH)2 (s) ⇌ Ba2+ (aq) + 2OH- (aq)

If the initial concentration of Ba (OH)2 is [Ba(OH)2] = 2M, what is the concentration of

[H3O+] at equilibrium?

How many moles of Z (aq) must be added to an empty 300 mL container to achieve

equilibrium molarity for R (aq) of 0.3 mol/L given the following system

2Q (aq) + R (aq) ⇌ 3Z (aq),

Where the K value is 3.2 x 10-6?

In a saturated solution of PbBr2, the molarity of Pb2+ ions are 8.2 x 10-2 mol/L, how

much would be the [Br-1] in g/L? (MBr=40 gr/mol)

A solution of hydrofluoric acid has a molar concentration of 0.01 mol/L, what is the pOH

of the solution? Ka=6.6x 10^-39

The solubility product (Ksp) is 0.005 for the reaction below,

Ba (OH)2 (s) ⇌ Ba2+ (aq) + 2OH-(aq)

If the initial concentration of Ba (OH)2 is [Ba(OH)2] = 2M, what is the concentration of

[H3O+] at equilibrium?