Concentration - Chemistry

Define Concentration (A)

The measure of the amount of dissolved solute in a given volume of solvent measured in g/L.

Describe concentration using examples of acids and bases (M)

Concentration is the measure of the amount of dissolved solute in a given volume of solvent measured in gL^-1. The more concentrated the solution, the more solute/particles it contains in a given volume. The more dilute the solution, the less solute/particles it contains in a given volume.

For example, a strong acid like hydrochloric acid (HCl) has a high concentration when it has many moles of HCl per litre of solution, while a weak acid like ethanoic acid has a lower concentration when dilute.

Calculate concentration of solvents using the equation c=m/V in g/L (E)

E.g. In 40L of Coke, there is 1280g of sugar. What is the concentration of sugar? INCLUDE UNITS AND SHOW ALL WORKING

c = m/V

c= 1280/40

c= 32g/L

Compare the concentrations of solutions (E)

MODEL ANSWER

Acid A has a concentration of 1 gL^-1 whereas acid B has a concentration of 5 gL^-1.  Therefore Acid B has a higher concentration (5 > 1) so there are more H⁺ particles per litre in acid B than in acid A. This means Acid B is more acidic and would have a lower pH. (It would react faster with a base as there are more H⁺ particles in the given volume)