Answer
a) calcium acetate
b) nickel phosphate
c) aluminium hydroxide
d) potassium dihydrogen phosphate
Work Step by Step
a) $Ca^{2+}$ calcium, $CH_3CO_2^-$ acetate: calcium acetate
b) $Ni^{2+}$ nickel, $PO_4^{3-}$ phosphate: nickel phosphate
c) $Al^{3+}$ aluminium, $OH^-$ hydroxide: aluminium hydroxide
d) $K^+$ potassium, $H_2PO_4^-$ dihydrogen phosphate: potassium dihydrogen phosphate