PH and Molar Solubility

PH and Molar Solubility. See attached for full problem description.

12. What is the pH of a 650 mL solution that contains 250g of HNO2 and 100g NaNO2?

13. What is the molar solubility of MnCO3 if 5.3 x 10^-5 M Na2CO3 is added to the solution?

14. What is the pH of a solution after titrating 200mL of 0.100 M NH2OH to the equivalence point with 200mL of 0.100 M HCl?

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