A lab technician adds 0.015 mol of KOH to 1.00 L of 0.0010 M Ca(NO_3)_2. K_sp =

Question

A lab technician adds 0.015 mol of KOH to 1.00 L of 0.0010 M Ca(NO_3)_2. K_sp = 6.5 times 10^-6 for Ca(OH)_2. Which of the following statements is correct? Calcium hydroxide precipitates until the solution is saturated. The solution is unsaturated and no precipitate forms. The concentration of calcium ions is reduced by the addition of the hydroxide ions. One must know K_sp for calcium nitrate to make meaningful predictions on this system. The presence of KOH will raise the solubility of Ca(NO_3)_2. Which of the following three buffer systems has the lowest pH? the aqueous buffer system which is [CHaCOOH] = 2.00 mol/L and [CHaCOONa] - 1 00 mol/L. the aqueous buffer system which is (CHaCOOH) = 1.00 mol/L and [CHaCOONal = 1.00 mol/L. the aqueous buffer system which is [CHaCOOH] = 1.00 mol/L and [CHaCOONa] = 2.00 mol/L. the aqueous buffer system which is [CHaCOOH] = 2.00 mol/L and [CHaCOONa] = 2.00 mol/L. all buffers have the same pH

Explanation / Answer

6. (A) Calcium hydroxide precipitates untill solution is saturated

    (E) The presence of KOH will increase the solubility of the product

7. (A) The aqueous buffer system which is CH3COOH = 2.00 mol/L, CH3COONa = 1 mol/ L

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