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The Mole Concept 2

The document contains a series of chemistry problems related to the mole concept, including calculations of moles, concentrations, and titrations involving sodium hydroxide, hydrochloric acid, and other compounds. It also addresses the concentration of lead in fruit juices and the neutralization reactions of sulfuric acid. Each problem is designed to test understanding of molarity and stoichiometry.

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jairusabraham96
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7 views2 pages

The Mole Concept 2

The document contains a series of chemistry problems related to the mole concept, including calculations of moles, concentrations, and titrations involving sodium hydroxide, hydrochloric acid, and other compounds. It also addresses the concentration of lead in fruit juices and the neutralization reactions of sulfuric acid. Each problem is designed to test understanding of molarity and stoichiometry.

Uploaded by

jairusabraham96
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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THE MOLE CONCEPT - 2

1. Calculate the amount in moles of solute in

(a) 250 cm3 of sodium hydroxide solution containing 1.00 mol/dm3 (2)

(b) 500 cm3 of sodium hydroxide solution containing 0.250 mol/dm3 (2)

(c) 250 cm3 of 0.0200 M calcium hydroxide solution (2)

2. Calculate the concentration in mol/dm3 of a solution containing 36.5 g of hydrogen chloride in


4.00 dm3 of solution. (2)

3. Calculate the amount of solute in moles in 250 cm3 of a solution of sodium hydroxide which
has a concentration of 2.00 mol/dm3. (2)

4. In a titration, 10 cm3 of a solution of unknown concentration of sodium hydroxide is titrated


against 25 cm3 standard hydrochloric acid solution of concentration 0.90 mol/dm 3. What is the
concentration in mol/dm3 of the sodium hydroxide solution? (2)

5. What volume of hydrochloric acid of concentration 0.25 mol/dm 3 (0.25 M) is needed to


neutralize 5.3 g of anhydrous sodium carbonate? (2)

CHEMISTRY WORKSHEETS BVTL


THE MOLE CONCEPT - 2

6. 25.0 cm3 of a solution of potassium hydroxide is neutralised by 35.0 cm 3 of aqueous


hydrochloric acid of concentration 0.75 mol/dm 3. Find the concentration of the potassium
hydroxide solution in moles/dm3 and grams/dm3 . (2)

7. Hydrogen is formed by the reaction of a solution of sulphuric acid with an excess of


magnesium. What volume of aqueous sulphuric acid, of concentration 1.5 mol/dm 3, must be
used to give 1200 cm3 of hydrogen (at r.t.p.)? (2)

8. Recently a chain of American cafeterias started giving away brightly painted drinking glasses.
It was found that lead compounds in the paint dissolved in acidic drinks, such as fruit juices. In
one test, 100 cm3 of juice were found to contain 4.0 mg of lead. What was the concentration of
lead in
(a) g/dm3 (b) mol/dm3? (3)

9. 1 mole of H2SO4 will neutralise (5)

(a) 500 cm3 of NaOH(aq) of concentration 4 mol/dm3 True or False?

(b) 1 dm3 of KOH(aq) of concentration 1 mol/dm3

(c) 400 cm3 of NaOH(aq) of concentration 5 mol/dm3

(d) 500 cm3 of Na2CO3(aq) of concentration 1 mol/dm3

(e) 2 dm3 of Na2CO3(aq) of concentration 0.5 mol/dm3

CHEMISTRY WORKSHEETS BVTL

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