10. Phosphoric acid is a triprotic acid and has values of pKa1 = 2.12, pKa2 = 7.21, and pKa3 = 12.38 at 25 ºC. A student conducts a titration where 150 mL of 0.100 M NaOH(aq) is added to 100 mL of a 0.100 M H3PO4(aq) solution. i. Which species are present in large quantities in the solution at equilibrium at this point? ii. What is the pH of the solution?

This question is about electrolysis. metal spoons can be coated with silver. this is called electroplating. suggest one reason why spoons are electroplated?

Why must humans find substitutes for many minerals found on earth? (a) form at an extremely slow rate (b) controlled by other countries (c) too deep in the earth to collect

An unknown substance is a white solid at room temperature and has a melting point of 78 °c. which of the following substances is most likely to be the identity of the unknown sample? a. naphthalene, a molecular solid with the formula c10h8 b. silica, a network solid held together by covalent bonds with the formula sio2 c. calcium chloride, an ionic compound with the formula cacl2 d. water, an molecular compound with the formula h2o