Need help with these 3 problems pls helps

Compare the following: Acid 1: phosphoric acid, H3PO4 Acid 2: hydrogen sulfide ion, HS Acid 3: carbonic acid, H2CO3 What is the formula for the strongest acid? Compare the following: Acid 1: sulfurous acid, H2SO3 Acid 2: hydrofluoric acid, HF Acid 3: nitrous acid, HNO2 What is the formula for the strongest acid ? The hydronium ion concentration in an aqueous solution at 25C is 5.4102M. The hydroxide ion concentration is M. The pH of this solution is The pOH is