WJEC GCSE Chemistry 3 Chemical Calculations/ Titrations

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Preview of WJEC GCSE Chemistry 3 Chemical Calculations/ Titrations

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Triple Chemistry Revision Notes:
Chemical Calculations
Atoms of different elements have different masses. This is determined by the number of protons in
an atom (the atomic mass/ Ar values).
Ar values- Atomic mass. This is the number of protons in the atoms.
Mr values- Molecular mass; this is the combined atomic mass of a compound. This can be calculated
by adding together the atomic mass values.
Mole- This is a unit of measurement which in grams, is equivalent to the relative molecular mass (Mr)
of a substance. Moles can also be written as mol, or no. moles (number of moles).
Titration Calculations:

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Worked Example-
10.0cm3 of a solution of Potassium Hydroxide was titrated with a 0.10M solution of Hydrochloric
Acid. 13.5 cm3 of the acid was required for neutralisation. Calculate the concentration of the
potassium hydroxide solution.
Step 1: Write down the concentrations, volumes ad number of moles that you know for each
compound. Make sure to convert the volume into litres/ dm3 if it's given in cm3.
Hydrochloric Acid
Concentration- 0.10 M
Volume- 13.5 cm3 / 1000 = 0.…read more

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Step 4: You now have enough information to work out the concentration of Potassium Hydroxide.
Use the triangle again to find out which formula to use.
Concentration= = 0.…read more


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