A plot of log(solubility of AgBr) versus log[Br−] at 25 °C is linear with a slope of −0.99. When the concentration of NaBr is increased from 0.0050 M to 0.050 M, what is the approximate percent decrease in the molar solubility of AgBr predicted by this trend?
a) about 99 %
b) about 68 %
c) about 90 %
d) about 10 %