A solution contains 10 g of KNO3 per 100 g of water at 30˚C. Is the solution unsaturated, saturated or supersaturated?

A solution contains 10 g of KNO3 per 100 g of water at 30˚C. Is the solution unsaturated, saturated or supersaturated?

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  1. Explanation:    As you can see, potassium nitrate has s solubility of about  

    67 g / 100g H

    2

    O

    at  

    40

    C

    . This means that at  

    40

    C

    , a saturated potassium nitrate solution will contain  

    67 g

    of dissolved salt for every  

    10 0g

    of water.

    You know that at this temperature, your solution contains  

    35 g

    of potassium nitrate in  

    100 g

    of water. This solution will be unsaturated because it contains less potassium nitrate than the maximum amount that can be dissolved.

    In order to make a saturated solution, you must get the total mass of potassium nitrate to  

    67 g

    , which means that you must add

    mass of KNO

    3

    a

    to be added

    =

    67 g

    35 g

    =

    ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯

    a

    a

    32 g

    a

    a

    −−−−−−−−

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