The solubility of group 2 hydroxides is given in the table below. Calculate the mass of calcium hydroxide that will dissolve in 50 g of water at 298 K . Group 2 hydroxides Solubility at 298 K ( mol / 100 g of water) Mg ( OH ) 2 2 . 0 × 10 - 5 Ca ( OH ) 2 1 . 5 × 10 - 3 Sr ( OH ) 2 3 . 4 × 10 - 3 Ba ( OH ) 2 1 . 5 × 10 - 2

From the given table, the solubility of calcium hydroxide at 298 K is 1 . 5 × 10 - 3 mol per 100 g of water. The molar mass of calcium hydroxide ( Ca ( OH ) 2 ) is = 40 + 2 16 + 1 = 74 g mol - 1 Therefore, mass dissolved in 100 g of water = 1 . 5 × 10 - 3 × 74 = 0 . 111 g And, the mass dissolved in 50 g of water = 0 . 111 2 = 0 . 0555 g

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AS and A Level

IMPORTANT

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Radium ( $Ra$ ) is a radioactive element found below barium at the bottom of Group 2. Applying your knowledge of Group 2, discuss and predict with a partner the formula of its oxide and hydroxide.

Important Questions on Group 2

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AS and A Level

IMPORTANT

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 11 - Group 2>Question>Q 3

Radium (

Ra

) is a radioactive element found below barium at the bottom of Group 2. Applying your knowledge of Group 2, discuss and predict with a partner its first ionisation energy.

EASY

AS and A Level

IMPORTANT

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 11 - Group 2>Question>Q 3

Radium (

Ra

) is a radioactive element found below barium at the bottom of Group 2. Applying your knowledge of Group 2, discuss and predict with a partner its reactivity compared with barium.

MEDIUM

AS and A Level

IMPORTANT

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 11 - Group 2>Question>Q 3

Radium ( $Ra$ ) is a radioactive element found below barium at the bottom of Group 2. Applying your knowledge of Group 2, discuss and predict with a partner the relative pH of its saturated hydroxide solution compared with a saturated solution of calcium hydroxide.

MEDIUM

AS and A Level

IMPORTANT

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 11 - Group 2>Question>Q 3

Radium ( $Ra$ ) is a radioactive element found below barium at the bottom of Group 2. Applying your knowledge of Group 2, discuss and predict with a partner the solubility of its sulfate compared with strontium sulfate.

EASY

AS and A Level

IMPORTANT

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 11 - Group 2>Question>Q 3

Radium (

Ra

) is a radioactive element found below barium at the bottom of Group 2. Applying your knowledge of Group 2, discuss and predict with a partner the equation for the reaction of its solid oxide with dilute hydrochloric acid.
.

EASY

AS and A Level

IMPORTANT

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 11 - Group 2>Question>Q 3

Radium (

Ra

) is a radioactive element found below barium at the bottom of Group 2. Applying your knowledge of Group 2, discuss and predict with a partner what you would expect to see if you mixed radium hydroxide solution with dilute sulfuric acid.

MEDIUM

AS and A Level

IMPORTANT

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 11 - Group 2>Question>Q 3

The solubility of group 2 hydroxides is given in the table below. Calculate the mass of calcium hydroxide that will dissolve in $50 g$ of water at $298 K$ .

Group 2 hydroxides	Solubility at $298 K$ ( $mol / 100 g$ of water)
$Mg {(OH)}_{2}$	$2.0 \times 10^{- 5}$
$Ca {(OH)}_{2}$	$1.5 \times 10^{- 3}$
$Sr {(OH)}_{2}$	$3.4 \times 10^{- 3}$
$Ba {(OH)}_{2}$	$1.5 \times 10^{- 2}$

EASY

AS and A Level

IMPORTANT

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 11 - Group 2>Questions>Q 4

Write the chemical formula of magnesium carbonate.

Radium (Ra) is a radioactive element found below barium at the bottom of Group 2. Applying your knowledge of Group 2, discuss and predict with a partner the formula of its oxide and hydroxide.

Important Questions on Group 2

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Radium ( $Ra$ ) is a radioactive element found below barium at the bottom of Group 2. Applying your knowledge of Group 2, discuss and predict with a partner the formula of its oxide and hydroxide.