Answer to Question #96024 in General Chemistry for Arash Moayedi

Question

Solid sodium hydroxide is slowly added to 50.0 mL of a 0.0356 M chromium(III) nitrate solution. The concentration of hydroxide ion required to just initiate precipitation is

Answer 1

Cr(NO₃)₃ + 3NaOH → Cr(OH)₃ + 3NaNO₃

n= Cm x V = 0.0356 x 0.05 = 0.00178.

1:3 = 0.00178 x 3 = 0.00534