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3.4 Concentration of Solutions
Which of the following is the expression used to calculate concentration in g/dm³? A Concentration = \frac{mass \ of \ solute \ in \ g}{volume \ of \ solution \ in \ dm^3} B Concentration = \frac{mass \ of \ solvent \ in \ g}{volume \ of \ solution \ in \ dm^3} C Concentration = mass of solute in g \ times volume of solution in dm³ D Concentration = \frac{mass \ of \ solute \ in \ g}{1000 \ times volume \ of \ solution \ in \ dm^3} Your answer

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Which of the following is the expression used to calculate concentration in g/dm³? A Concentration = \frac{mass \ of \ solute \ in \ g}{volume \ of \ solution \ in \ dm^3} B Concentration = \frac{mass \ of \ solvent \ in \ g}{volume \ of \ solution \ in \ dm^3} C Concentration = mass of solute in g \ times volume of solution in dm³ D Concentration = \frac{mass \ of \ solute \ in \ g}{1000 \ times volume \ of \ solution \ in \ dm^3} Your answer - OCR Gateway - GCSE Chemistry - Question 15 - 2019 - Paper 4

Question 15

$Which-of-the-following-is-the-expression-used-to-calculate-concentration-in-g/dm³?--A-Concentration-=-\frac{mass-\-of-\-solute-\-in-\-g}{volume-\-of-\-solution-\-in-\-dm^3}--B-Concentration-=-\frac{mass-\-of-\-solvent-\-in-\-g}{volume-\-of-\-solution-\-in-\-dm^3}--C-Concentration-=-mass-of-solute-in-g-\-times-volume-of-solution-in-dm³--D-Concentration-=-\frac{mass-\-of-\-solute-\-in-\-g}{1000-\-times-volume-\-of-\-solution-\-in-\-dm^3}--Your-answer--OCR Gateway-GCSE Chemistry-Question 15-2019-Paper 4.png$

Which of the following is the expression used to calculate concentration in g/dm³? A Concentration = \frac{mass \ of \ solute \ in \ g}{volume \ of \ solution \ in ... show full transcript

Worked Solution & Example Answer:Which of the following is the expression used to calculate concentration in g/dm³? A Concentration = \frac{mass \ of \ solute \ in \ g}{volume \ of \ solution \ in \ dm^3} B Concentration = \frac{mass \ of \ solvent \ in \ g}{volume \ of \ solution \ in \ dm^3} C Concentration = mass of solute in g \ times volume of solution in dm³ D Concentration = \frac{mass \ of \ solute \ in \ g}{1000 \ times volume \ of \ solution \ in \ dm^3} Your answer - OCR Gateway - GCSE Chemistry - Question 15 - 2019 - Paper 4

Step 1

A Concentration = \frac{mass \ of \ solute \ in \ g}{volume \ of \ solution \ in \ dm^3}

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Answer

This expression correctly defines concentration in grams per cubic decimeter, as concentration is the ratio of the mass of the solute to the volume of the solution. This means it gives the right relationship for calculating concentration.

Step 2

B Concentration = \frac{mass \ of \ solvent \ in \ g}{volume \ of \ solution \ in \ dm^3}

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Answer

This expression is incorrect because it refers to the mass of the solvent rather than the solute, which is not what is needed to determine concentration.

Step 3

C Concentration = mass of solute in g \ times volume of solution in dm³

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Answer

This is incorrect; concentration should be a ratio, not a multiplication. This expression does not yield a meaningful unit of concentration.

Step 4

D Concentration = \frac{mass \ of \ solute \ in \ g}{1000 \ times volume \ of \ solution \ in \ dm^3}

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Answer

This expression is also incorrect as it contains an unnecessary factor of 1000, which does not conform to the standard expression for concentration.

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Questions answered

A Concentration = \frac{mass \ of \ solute \ in \ g}{volume \ of \ solution \ in \ dm^3}

B Concentration = \frac{mass \ of \ solvent \ in \ g}{volume \ of \ solution \ in \ dm^3}

C Concentration = mass of solute in g \ times volume of solution in dm³

D Concentration = \frac{mass \ of \ solute \ in \ g}{1000 \ times volume \ of \ solution \ in \ dm^3}

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