Question

Find proportions of each ingredient including the amount of water you must start with.

Ca(NO3)2-SiO2 composite gel electrolyte was prepared with a sol-gel method, Ca(NO3)2 aqueous solution was firstly prepared by adding Ca(NO3)24H2O in deionized water. Then 90%wt of 2 M Ca(NO3)2 solution, 10wt% of SiO2 powder (as gelating agent) and 1wt% carboxymethylcellulose

Answer 1

Answer to Question #61973, Chemistry / Other

Find proportions of each ingredient including the amount of water you must start with.

$\mathrm{Ca(NO_3)_2 - SiO_2}$ composite gel electrolyte was prepared with a sol-gel method, $\mathrm{Ca(NO_3)_2}$ aqueous solution was firstly prepared by adding $\mathrm{Ca(NO_3)_2\cdot 4H_2O}$ in deionized water. Then $90\%$ wt of $2\mathrm{M}$ $\mathrm{Ca(NO_3)_2}$ solution, $10\mathrm{wt}\%$ of $\mathrm{SiO_2}$ powder (as gelating agent) and $1\mathrm{wt}\%$ carboxymethylcellulose

Answer:

Suppose you need $101\mathrm{g}$ of final gel. You need $1\mathrm{g}$ of carboxymethylcellulose, $10\mathrm{g}$ of $\mathrm{SiO}_2$ powder and $90\mathrm{g}$ of $2\mathrm{M}$ $\mathrm{Ca(NO_3)_2}$ solution. Suppose its density approx. $1\mathrm{g / ml}$ . So

$$n \left(\mathrm {C a} \left(\mathrm {N O} _ {3}\right) _ {2}\right) = \frac {2 \frac {\mathrm {m o l}}{\mathrm {L}} \times 9 0 \mathrm {g}}{1 0 0 0 \frac {\mathrm {g}}{\mathrm {L}}} = 0. 1 8 \mathrm {m o l}$$

Since

$$n \left(\mathrm {C a} \left(\mathrm {N O} _ {3}\right) _ {2}\right) = n \left(\mathrm {C a} \left(\mathrm {N O} _ {3}\right) _ {2} \times 4 H _ {2} O\right) = 0. 1 8 \mathrm {m o l}$$

So

$$m \left(\mathrm {C a} \left(\mathrm {N O} _ {3}\right) _ {2} \times 4 H _ {2} O\right) = 0. 1 8 \mathrm {m o l} \times 2 3 6. 1 4 9 \frac {\mathrm {g}}{\mathrm {m o l}} = 4 2. 5 \mathrm {g}$$

Thus, mass of water to prepare solution:

$$m = 9 0 g - 4 2. 5 g = 4 7. 5 g$$

Answer:

Proportions are:

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