Question

PART I Phosphorous acid, H3PO3(aq), is a diprotic oxyacid that is an important compound in industry and agriculture. A flask contains 45 ml of H3PO3(aq) A titration is carried out and analysis of the data showed that the first equivalence point was reached after 33 ml of 0.50 M NaOH was added to the acid solution. Answer the following questions: What was the initial concentration in M of [H3PO3], the phosphorous acid solution

Answer 1

Use mv=mv formula to solve for h3po3
Given. 45ml h3po3 in a flask and the first equi point is 33ml of .5M NaOH
Plug in 33 * 0.5 M = 45 *x, where x is the concentration of h3po3, solve for x