a is a buffer. Weak acid and salt of the weak acid. Use the Henderson-Hasselbalch equation.
b. Zn(OH)2 is a Ksp problem. Solve for solubility Zn(OH)2, get the OH from that and convert to pH.
a) Calc. PH of 0.010 M HF and 0.030 M KF
e) calc. PH Zn(OH)2 in wAter
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