Of the substances below, will decrease the solubility of Pb(OH)_2 in a saturated
ID: 1021878 • Letter: O
Question
Of the substances below, will decrease the solubility of Pb(OH)_2 in a saturated solution. BaNO_3 H_2O_2 HNO_3 Pb(NO_3)_2 NaCl Of the following solution, which has the greatest buffering capacity? 0.543 M NH_3 and 0.555 M NH_4 Cl 0.087 M NH_3 and 0.088 M NH_4Cl 0.234 M NH_3 and 0.100 M NH_4 Cl 0.100 M NH_3 and 0.455 M NH_4Cl They are all buffer solutions and would all have the same capacity. Which one of the following pairs cannot be mixed together to form a buffer solution? ?HONH_2, HONH_3Cl NaCl, HCl RbOH, HF KOH, HNO_2 H_2SO_3, KH_SO_3Explanation / Answer
8. answer is D
because Pb(NO3)2 produce common-ion-effect with Pb(OH)2
9. Hasselbach tells you that in each case you start from pH = pKa - log[A-]/[HA]
pH = pka - log[0.100]/[0.235]
pH = pKa +log[0.425]
so answer is C
10. answer is B
salt + acid can not mixed to buffer solution
buffer made by mixing acid + base
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