What happens to water when it warms above 4 C

An aqueous solution of hydroiodic acid is standardized by titration with a 0.186 m solution of calcium hydroxide. if 26.5 ml of base are required to neutralize 20.3 ml of the acid, what is the molarity of the hydroiodic acid solution? m hydroiodic acid

What is the formula that this ionic compounds could form sr2+p3-o2-

In the following redox reaction which is the oxidizing agent and which is the reducing agent? alcl3 + na nacl + al