Anonymous
Anonymous asked in Science & MathematicsChemistry · 1 decade ago

How do you find concentration?

When 7.6 g of NaCl(s) is added to a 250 mL solution of 0.78 M silver nitrate (AgNO3), the chloride ions combine with silver ions, and precipitate as AgCl(s) at the bottom of the solution. What concentration of Ag+ ions remains dissolved in the water?

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  • 1 decade ago
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    find moles

    (7.6 g NaCl) divided by (a molar mass of 58.44 g/mol) = 0.130 moles of NaCl

    find moles:

    0.250 litres @ 0.78 mol / litre = 0.195 moles of AgNO3

    by the reaction:

    1 NaCl & 1 AgNO3 -- 1 AgCl & 1 NaNO3

    0.130 moles of NaCl reacts with an equal number of moles of AgNO3: 0.130 moles of AgNO3

    0.195 moles of AgNO3 - 0.130 moles of AgNO3 reacted = 0.065 moles AgNO3 remain

    find molarity

    0.065 moles AgNO3 / 0.250 litres = 0.26 Molar AgNO3

    0.26 Molar AgNO3

    releases

    0.26 Molar Ag+ ion

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