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Q. Q8. The Molarity and molality of a solution are $\mathrm{M}$ and $\mathrm{m}$ respectively. If the molecular weight of the solute is $M^1$, prove the density of the solution in terms of $M,m$ and $M^1$ is $\left[D=M\left(\frac{1}{m}+\frac{M^{\prime }}{1000}\right)\right]$.

1. Q9. Calculate the percentage composition in terms of mass of a solution obtained by mixing $300\mathrm{g}$ of a $25\%$ and $400\mathrm{g}$ of a $40\%$ solution by mass.
2. $(33.6\%)$
3. Q10. An aqueous solution of sodium chloride is marked $10\%(\mathrm{w}/\mathrm{w})$ on the bottle. The density of the solution is $1.071\mathrm{g}{\mathrm{mL}}^{-1}$. What is its molality and Molarity? Also, what is the mole fraction of each component in the solution? $(1.8\mathrm{m},1.82\mathrm{M},0.03)$
4. - Q11. 29.2\% (w/w) HCl(M=36.5) stock solution has a density of $1.25\mathrm{gm}/\mathrm{ml}$. The volume (in $\mathrm{ml}$ ) of stock solution required to prepare a $200\mathrm{ml}$ solution of $0.4\mathrm{M}\mathrm{HCl}$ is

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Updated on: Nov 11, 2022