28. AgNO_(3)+KClarrow __ 29. Al(OH)_(3)+HC_(2)H_(3)O_(2)arrow __ 30 Al_(2)(SO_(4))_(3)+Ca_(3)(PO_(4))_(2)arrow __ 31. K_(2)SO_(4)+MgCl_(2)arrow __

28. $AgNO_{3}+KCl\rightarrow AgCl\downarrow +KNO_{3}$<br />29. $Al(OH)_{3}+HC_{2}H_{3}O_{2}\rightarrow Al(C_{2}H_{3}O_{2})_{3}+3H_{2}O$<br />30. $Al_{2}(SO_{4})_{3}+Ca_{3}(PO_{4})_{2}\rightarrow 2AlPO_{4}+3CaSO_{4}$<br />31. $K_{2}SO_{4}+MgCl_{2}\rightarrow 2KCl+MgSO_{4}$