Question

1)it is required to prepare a solution of NaCl of volume=100ml and concentration C1=0.2mol/L from another solution of NaCl of concentration C=2mol/L.

1. calculate the volume that should be used for performing the dilution.
2. the prepared solution is divided into 2 equal parts. find the molar concentration of each part

Answer 1

(i) Volume of water to be added = $(V2-V1)$ ml

= $\frac{V1C1}{C2}-V1$

$= \frac{100\times0.2}{2}-100$

= 900 ml

(ii) molar concentration = 1.1M