Q3) Salts can be made by adding different substances to dilute hydrochloric acid.For which substance could any excess not be removed by filtration?A copper(II) oxideB magnesiumC sodium hydroxideD zinc hydroxide
Question
Q3) Salts can be made by adding different substances to dilute hydrochloric acid.For which substance could any excess not be removed by filtration?A copper(II) oxideB magnesiumC sodium hydroxideD zinc hydroxide
Solution
The answer is C) Sodium Hydroxide.
Here's the step by step explanation:
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When a substance is added to a dilute hydrochloric acid, a reaction occurs and a salt is formed.
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If the substance added is insoluble in water (like copper(II) oxide and zinc hydroxide), any excess of it can be removed by filtration because it will not dissolve and will remain as solid particles that can be caught by the filter.
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However, if the substance added is soluble in water (like sodium hydroxide and magnesium), it will dissolve completely and form a solution.
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In the case of magnesium, it will react with hydrochloric acid until one of them is completely used up. If there is any excess magnesium, it will remain as solid particles that can be removed by filtration.
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But in the case of sodium hydroxide, it will dissolve completely in the solution and will not leave any solid particles that can be removed by filtration. Therefore, any excess sodium hydroxide cannot be removed by filtration.
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