An 8.65 g sample of an unknown group 2a metal hydroxide is dissolved in 85.0 ml of water and titrated with 2.50 m hcl(aq). if it takes 56.9 ml of the acid to reach the end point of the titration (a) what is the molar mass of the metal hydroxide? (b) which of the following is in the metal hydroxide: ca2+, sr2+, ba2+?

(a)The molar mass of the metal is 121.66 g/mol.

              (b) The metal hydroxide is .

Explanation:

The equation for the reaction is as follows.

(a) When 56.9 mL of the acid is required to reach end point of titration. Then,

Moles of acid =

                        =

                        = 0.14225 moles

Hence, the number of moles of hydroxide = 1 - 0.14225 = 0.0711 moles

It is given that mass of sample is 8.65 g, then calculate the molar mass of the sample as follows.

                                     =

                                     = 121.66 g/mol

The molar mass of the metal is 121.66 g/mol.

(b) The molar mass calculated is 121.66 g/mol. Therefore, calculate the molar mass of each given metal hydroxide as follows.

= (40.078 + 34) g/mol = 74.093 g/mol

= (87.66 + 34) g/mol = 121.66 g/mol

= (137.32 + 34) g/mol = 171.32 g/mol

Thus, it can be concluded that the metal in the metal hydroxide is .

here is table 2-2:

country

percent of eligible voters that voted

rank

united states

44.9%

138

canada

60.1%

107

costa rica

84.6%

14

hungary

66.9%

82

japan

57.0%

118

egypt

27.7%

159

south africa

85.5%

10

ans is no, the data set cannot be plotted as a single circle graph

the answer is a for sure mark brainliest i had got this right on usatestprep