A 100.0-mL aliquot of 0.200 M aqueous potassium hydroxide is mixed with 100.0 mL of 0.200 M
aqueous magnesium nitrate.
(a) Write a balanced chemical equation for any reaction that occurs.
(b) What precipitate forms?
(c) What mass of precipitate is produced?
(d) Calculate the concentration of each ion remaining in solution after precipitation is complete.
i mostly need help on the last one