Explain an aqueous of solution of phosphoric acid typically 5% by weight H3PO4, p=1.03 g mL-1 is sometimes used to remove deposits in a power plant. State the successive Ka values for the ionization of phosphoric acid are 7.1 x 10-3, 6.3 x 10-8, and 4.3 x 10-13.
Explain is phosphoric acid a strong or weak acid with reference to above data?