Calcium sulfate Calcium hydroxide and sulfuric acid are strong base and acid respectively. So the conjugate acid and base are both weak. Hence the salt is neutral KNO2 KOH is a strong base but HNO2 is a weak acid So the conjugate base of HNO2 will be strong and the salt will be basic Fe(ClO4)3 Fe(OH)3 is a weak base while HClO4 is a strong acid So the conjugate acid of Fe(OH)3 will be strong and the salt will be acidic NaI NaOH is a strong base while HI is weak acid. So the conjugate base will be strong and the salt will be basic. Solution Calcium sulfate Calcium hydroxide and sulfuric acid are strong base and acid respectively. So the conjugate acid and base are both weak. Hence the salt is neutral KNO2 KOH is a strong base but HNO2 is a weak acid So the conjugate base of HNO2 will be strong and the salt will be basic Fe(ClO4)3 Fe(OH)3 is a weak base while HClO4 is a strong acid So the conjugate acid of Fe(OH)3 will be strong and the salt will be acidic NaI NaOH is a strong base while HI is weak acid. So the conjugate base will be strong and the salt will be basic..