Calculate the ph of a solution prepared by dissolving 2.129 g of solid anhydrous na2hpo4 (fw, 141.98) in about 50 ml of water, adding 1.000 ml of 6.00 m hno3, and diluting the mixture with water to 100.0 ml. the stepwise acid dissociation constants for phosphoric acid are 7.11 × 10-3, 6.32 × 10-8, and 7.1 × 10-13. assume the activity coefficients are equal to 1.00.

Why are the trends and exceptions to the trends in ionization energy observed?

Silver tarnishes as silver metal reacts with hydrogen sulfide, h2s, in the air. in this reaction, dark silver sulfide, au2s, covers the surface of silver. when silver is polished, this coating of silver sulfide can be removed from the surface. this makes the silver shiny again. enter the coefficients that balance the tarnishing reaction equation. (type 1 for no coefficient.)

In 1901, thomas edison invented the nickel-iron battery. the following reaction takes place in the battery. fe(s) + 2 nio(oh)(s) + 2 h2o(l) fe(oh)2(s) + 2 ni(oh)2(aq) how many mole of fe(oh)2, is produced when 5.35 mol fe and 7.65 mol nio(oh) react?