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Questions and Answers
What is the unit of concentration that is best used to describe very dilute solutions?
What is the concentration of a solution that contains 5 grams of solute in 100mls of solution?
What is the molecular weight (Mr) of NaOH?
How many moles of HCl are in 100cm³ of 0.1M hydrochloric acid solution?
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What is the concentration of a solution that contains 10 grams of solute in 1000mls of solution?
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What is the unit of concentration that is equivalent to grams per litre (g/L)?
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What is the molecular weight (Mr) of CuSOâ‚„?
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How many grams of KOH are contained in 500cm³ of 0.02 M KOH solution?
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What is the concentration of a solution that contains 2.125g of salt (NaCl) in 250mls of water?
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What is the relationship between concentration in g/L and M?
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Study Notes
Concentration of Solutions
- Concentration is the amount of solute in a specified amount of solution.
- It can be expressed as moles per liter (M), grams per liter (g/L), and parts per million (ppm).
Converting between Concentration Units
- To convert g/L to M, divide by the molar mass (Mr).
- To convert g/L to ppm, multiply by 1000.
- To convert M to g/L, multiply by the molar mass (Mr).
- To convert ppm to g/L, divide by 1000.
Calculating Concentration
- To calculate the concentration of a solution, you need to know the amount of solute and the volume of the solution.
- Example: 1g of copper sulfate (CuSOâ‚„) in 100mls of water has a concentration of 10g/L.
Expressing Concentration in Different Units
- Example: 0.006 M NaOH solution is equivalent to 0.24g/L and 240ppm.
- Example: 74ppm solution of HCl is equivalent to 0.074g/L and 0.002 M.
Calculating Mass of Solute
- To calculate the mass of solute, you need to know the volume, concentration, and molar mass of the solute.
- Example: 500cm³ of 0.02 M KOH solution contains 5.6g of KOH.
Calculating Moles of Solute
- To calculate the moles of solute, you need to know the volume and concentration of the solution.
- Example: 100cm³ of 0.1M hydrochloric acid solution contains 0.01 moles of HCl.
Concentration Involving Percentages
- 5% w/v means 5g of solute in 100mls of solvent.
- 6% v/v means 6mls of solute in 100mls of solvent.
- 11% w/w means 11g of solute in 100g of solvent.
Calculating Percentage Concentration
- Example: 2.125g of salt (NaCl) in 250mls of water has a concentration of 0.85% w/v.
- Example: A 500mls bottle of beer containing 25mls of pure alcohol has a concentration of 5% v/v.
- Example: 40g of a solution containing 5g of solute has a concentration of 12.5% w/w.
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Description
Understanding the concentration of solutions is crucial for titration. This quiz covers the concepts of moles per liter, grams per liter, and parts per million, as well as conversion between these units.
