Zadania z chemii IB HL

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Filtry i umiejętności1

Most pools, including this lido, are dosed with sodium hypochlorite solution, $\ce{NaOCl(aq)}$

, instead of chlorine gas. Suggest why pool operators avoid dosing the water with chlorine gas itself.

The student measures the hydrogensulfite concentration by titrating samples against a standard iodine solution, with starch as the indicator. Every three days, 25.00 $\mathrm{cm^3}$ of cordial is withdrawn from each flask, diluted to 250.0 $\mathrm{cm^3}$ with…

Sketch how the combined mass of the flask, the syringe and their contents would change with time during Experiment 1, and give a reason for the shape of your sketch. Label the axes 'Total mass' and 'Time'.