An 8.65-g sample of an unknown group 2A metal hydroxideis dissolved in 85.0 mL of water. An acid–base indicator isadded and the resulting solution is titrated with 2.50 MHCl(aq) solution. The indicator changes color, signaling thatthe equivalence point has been reached, after 56.9 mL of thehydrochloric acid solution has been added. (a) What is themolar mass of the metal hydroxide? (b) What is the identityof the metal cation: Ca2+, Sr2+, or Ba2+?

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