An acid can be reacted with a base in a titration experiment - Edexcel - GCSE Chemistry - Question 3 - 2015 - Paper 1

The correct answer is:

✔ D acid + base → salt + water.

To find the mass of sodium hydroxide transferred to the flask, subtract the mass of the empty container from the total mass:

$ext{mass of sodium hydroxide} = ext{mass of container + solid sodium hydroxide} - ext{mass of empty container}$

So,

$ext{mass of sodium hydroxide} = 17.12 ext{ g} - 7.02 ext{ g} = 10.10 ext{ g}$.

The concentration of sodium hydroxide solution can be calculated using the formula:

ext{Concentration} = rac{ ext{mass of sodium hydroxide}}{ ext{volume of solution}}

Here, the volume of the solution is 2 dm³:

ext{Concentration} = rac{10.10 ext{ g}}{2 ext{ dm}^3} = 5.05 ext{ g dm}^{-3}.