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An 8.65-g sample of an unknown group 2 metal hydroxide
is dissolved in 85.0 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
the equivalence point has been reached, after 56.9 mL of the
hydrochloric acid solution has been added. (b) What is the identity
of the metal cation: Ca2+, Sr2+, or Ba2+?