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When asked for the solubility of a molecule, you ask yourself - what is the number of
moles of PbF2 I can dissolve in 1 L of water?
[H+][OH-] = 1 x 10-14
If you’re being given a Ka, then you know it’s an acid
pH + pOH = 14
Office Hours Again
-​ Calculate the pH when 40 mL of 0.15 M KOH is mixed with 20 mL of 0.3 M HBrO, and
Ka=2.5 x 10-9
-​ KOH + HBrO <-> H2O + K+ + BrO-​ 0.006 mol KOH + 0.006 mol HBrO -> 0.006 mol K+ (spectator) + 0.006 mol BrO(conjugate base)
-​ BrO- + H2O -> BrOH + OH-​
0.1 M
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answer-pH=10.8
Metal ions are going to be spectator ions
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[Y-]2[Ca2+]
[0.002]2[0.001]
—---------- = Ksp = —----------------- = 4 x 10-9