Question

if you had an aqueous mixture that contained ag⁺, k⁺, and pb²⁺ cations, how many different solids could precipitate if a chloride solution was added?
a 3
b 4
c 1
d 2

Explanation:

Step1: Recall solubility rules

Silver chloride ($AgCl$) and lead - chloride ($PbCl_2$) are insoluble in water, while potassium chloride ($KCl$) is soluble.

Step2: Determine precipitates

When a chloride solution is added to the mixture containing $Ag^+$, $K^+$, and $Pb^{2 + }$ cations, $Ag^+$ will form $AgCl$ precipitate and $Pb^{2+}$ will form $PbCl_2$ precipitate. $K^+$ will not form a precipitate as $KCl$ is soluble.

Answer:

D. 2