STANDARD GRADE CHEMISTRY CALCULATIONS

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STANDARD GRADE CHEMISTRYCALCULATIONS

• Titrations
• V x C x P(acid) V x C X P(alkali)
• Where V is the volume.
• C is the concentration
• P is the Power of the acid or alkali.

Worked example 1. Calculate the volume of 0.25
mol/l sodium hydroxide needed to neutralise 20
cm3 of 0.1 mol/l sulphuric acid.
V x C x P(acid) V x C X P(alkali)
20 x 0.1 x 2 V x 0.25 X 1
4 V x 0.25
4 /0.25 V
16 cm3 V
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Calculations for you to try. 1. Calculate the
concentration of potassium hydroxide (KOH ) if
14.8 cm3 is required to neutralise 20cm3 of 0.1
mol/l nitric acid (HNO3).
V x C x P(acid) V x C X P(alkali)
20 x 0.1 x 1 14.8 x C X 1
2 14.8 x C
2 /14.8 C
0.135 mol/l C
Standard Grade Chemistry
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Calculations for you to try. 2. Calculate the
volume of 0.15 mol/l sulphuric acid(H2SO4) if it
is neutralised by 25 cm3 of 0.25mol/l sodium
hydroxide (NaOH).
V x C x P(acid) V x C X P(alkali)
V x 0.15 x 2 25 x 0.25 X 1
V x 0.30 6.25
V 6.25/ 0.30 20.83 cm3
Standard Grade Chemistry