4 questions here

please answer them asap

Calculate (to two decimal places) the solubility (in milligrams per liter, mgL1) of Ba3(PO4)2(Ks=3.41023 ) in water. QUESTION 6 Calculate (to two decimal places) the solubility (in micrograms per liter, L1) of Ba3(PO4)2(Ks=3.41023) in an aqueous solution of BaCl20.01M. QUESTON 7 Calculate (to two decimal places) the pH at the equilbrium of a solution of BaF2(K5(BaF2)=1.7106;Ka(HF)=6.8104). Question B Given a solution 0.01MotNiC2, caiculate (to two decimal places) the pH at which Ni(OH)2(K5=6.31016) will start precipitating