Question

5. Which of the following solutions when mixed will make a practical buffer solution?

a) 1 mole of NaOH and 0.5 mole of HBrO2 in 1L

b) 1 mole of HCl and 1.5 moles of NH3(aq) in 1L

c) 0.10 mole of sodium acetate and 0.10 mole of HCl in 1L

d) None

6. A sample of 25.0 mL of 0.030 M NaOH was titrated with sulfuric acid solution and 16.2 mL of titrant was used. The concentration of the sulfuric acid solution was:

a) 0.0324 b) 0.060 c) 0.0600 d) None. My value is .........

7. If solubility of Me(OH)3 is 4.0 x10-5 mol/L then the concentration of OH- ions in saturated solution of Me(OH)3 is

a) 6.0x10-8 b) 4.0x10-8 c) 6.0 x 10-4 d) 8.0 x 10-12 e) None. My value is .............

8. Solubility of Me(OH)2 = 2.36 x 10-4 mol/L. Solubility product of this salt is then closest to

a) 2.0 x 10-8 b) 2.0 x 10-12 c) 8.0 x 10-16 d) none. My answer: ........

Answer 1