ANSWER.
* Calculation of milliliters of KCL added.
Formula
Amount of KCL added (ml) = Amount desired /Amount in hand * Quantity.
Amount desired(D) = 40 mEq.
Amount in hand(H) = 2 mEq.
Quantity(Q) = 1 mL.
As per formula
Amount of KCL is added = D / H * Q
= 40 / 2 * 1
d = 20 mL.
* Calculation of amount of dilutent needed.
Amount of solution present in the stock =100 %
Amount of solution need to be prepared = 1L of 2%(w/v) solution.
= 1000 mL of 2%(w/v).
So
Amount of dilutent needed = (100% - 2%) 1000 ml.
= 98% * 1000 mL.
= 98/100 * 1000 mL.
= 0.98 * 1000 mL.
d = 980 mL.
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