A 4.36-g sample of an unknown alkali metal hydroxide is dissolvedin 100.0 mL of water. An acid–base indicator is added,and the resulting solution is titrated with 2.50 M HCl(aq)solution. The indicator changes color, signaling that theequivalence point has been reached, after 17.0 mL of the hydrochloricacid solution has been added. (a) What is the molarmass of the metal hydroxide? (b) What is the identity ofthe alkali metal cation: Li+, Na+, K+, Rb+, or Cs+?

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