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bebo14
03.12.2019 •
Social Studies
Asolution contains an unknown mass of dissolved silver ions. when potassium chloride is added to the solution, a white precipitate forms. the precipitate is filtered and dried and then found to have a mass of 245 mg. what mass of silver was in the original solution? (assume that all of the silver was precipitated out of solution by the reaction.)
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Ответ:
Mass of silver in the original solution = 0.1845 g
Explanation:
The precipitate must be of silver chloride. So,
Given that:
Mass of silver chloride = 245 mg = 0.245 g ( 1 mg = 0.001 g )
Molar mass of silver chloride = 143.32 g/mol
The formula for the calculation of moles is shown below:
Thus,
From the reaction,
1 mole of AgCl is formed from 1 mole of silver
So,
0.00171 mole of AgCl is formed from 0.00171 mole of silver
Moles of silver = 0.00171 moles
Molar mass of silver = 107.8682 g/mol
Mass = Moles*Molar mass = 0.00171 moles*107.8682 g/mol = 0.1845 g
Mass of silver in the original solution = 0.1845 g
Ответ:
Step-by-step explanation:
First put it in point slope for y = mx + b
y = -2x + 5
Now plug in what ever number you want for x and solve.