a. Write a balanced chemical equation, including state symbols, for the reaction of:

i. Strontium with oxygen

ii. Strontium oxide with water.

b. i. Write a balanced chemical equation, including state symbols, for the reaction of barium with water.

ii. Predict the pH of the solution formed in part b i.

c. Radium (Ra) is a radioactive element found below barium at the bottom of Group 2. Predict:
i. The formula of its ion

ii. The formula of its oxide and hydroxide

iii. Its first ionisation energy

iv. Its reactivity compared with barium

v. The relative pH of its saturated hydroxide solution compared with a saturated solution of calcium hydroxide

vi. The solubility of its sulfate compared with strontium sulfate.

d. Using Table 11.4 and the relative atomic mass data, calculate the mass of calcium hydroxide that will dissolve in 50 g of water at 298 K.

The Periodic Table of the Elements

Transcribed Image Text:

Group 2 element Solubility of hydroxide at 298 K / mol / 100 g of water magnesium hydroxide, Mg(OH), calcium hydroxide, Ca(OH), 2.0 x 10-5 1.5 x 10-3 strontium hydroxide, Sr(OH)2 3.4 x 103 barium hydroxide, Ba(OH), 1.5 x 10-2 Table 11.4 Solubility of the Group 2 hydroxides in water.