A sample of 7.8 g of potassium is reacted completely with water.
The reaction forms a solution of potassium hydroxide.
The total volume of the resulting solution is 3.2 dm3.
Calculate the concentration of the potassium hydroxide solution in g dm−3\text{g\ dm}^{-3}g dm−3.
(Relative atomic mass: K=39\text{K} = 39K=39; Relative formula mass: KOH=56\text{KOH} = 56KOH=56)
258 exam-style questions on Edexcel GCSE Chemistry Calculations involving masses. Each one has a worked solution and a mark scheme showing where the marks go.