Question 1
A 50.0 mL sample of 2.0 × 10
–4 M CuNO
3 is added to 50.0 mL of 4.0 M NaCN. The formation constant of the complex ion Cu(CN)
32– is 1.0 × 10
9. What is the copper(I) ion concentration in this system at equilibrium?
Question 2
A sample of rainwater collected near a lead smelter is analyzed for acid content. Experiments show that a 100. mL sample of the rainwater is neutralized by 22.4 milliters of 0.0122 M NaOH. Assuming that the acid present is sulfurous acid, which resulted from the reaction of SO
2 with water, what is the molarity of acid in the rainwater?