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Edexcel A-Level Chemistry AS 8.15 The Trends in Solubility of the Hydroxides and Sulfates of Group 2 Elements Questions

Remember hydroxide solubility increases while sulfate solubility decreases down the group, then use that direction to predict a precipitate or titre.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
AS

Exam points

  • State that hydroxide solubility increases while sulfate solubility decreases down Group 2.
  • Use sulfate precipitate formation to distinguish a Group 2 ion from a soluble alternative.
  • Interpret saturated-hydroxide titration data through the change in solubility down the group.

Edexcel A-Level Chemistry AS 8.15 The Trends in Solubility of the Hydroxides and Sulfates of Group 2 Elements Questions question 1

[Maximum number: 2]

A white anhydrous crystalline solid A contains one cation and one anion. Solid A was heated in a test tube and the following observations were made. A brown gas was produced. A glowing splint relit when placed in the mouth of the test tube. A white solid remained in the test tube.

About 5 cm35 \mathrm{~cm}^{3} of an aqueous solution of A was placed in each of two test tubes. Five drops of aqueous sodium hydroxide were added to one of the test tubes and five drops of dilute sulfuric acid were added to the other. In the table give the observations you would expect to make.

Table for Question Edexcel A-Level Chemistry AS 8.15 The Trends in Solubility of the Hydroxides and Sulfates of Group 2 Elements Questions question 1 — Edexcel A-Level Chemistry AS
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