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3.Standard solution of 111.0 mS at 25°C : Accurately weight out 74.2640 grams of
research grade dried Potassium Chloride (KCl). Dissolve it in 1000ml of deionized
water
You can store the remaining solution in a plastic container for one week but the air space
between the cap and the solution must be kept to an absolute minimum. The storage life
can be prolong by storing the solution below 4°C. If you have any doubt of the accuracy
of the stored solution, a fresh batch should be prepared.
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