Luckau Protocols:KCl

Purpose
In the Clark Lab, 3M KCl is used as a storage solution for the pH meter electrode.

Info

 * Potassium chloride, KCl
 * FW = 74.55 g/mol

Calculations

 * $$125 \mathrm{mL} \bullet \tfrac{3 \mathrm{mol}}{\mathrm{L}}\ \bullet \tfrac{\mathrm{L}}{1000 \mathrm{mL}}\ \bullet \tfrac{74.55 \mathrm{g}}{\mathrm{mol}}\ = 27.96 \mathrm{g}$$

To make 125 mL of 3M KCl

 * 1) Using digital scale, place 27.96g KCl powder into weigh boat
 * 2) In 150 mL flask, mix 27.96g KCl with 100 mL H2O
 * 3) Put flask on hotplate with stirbar until dissolved
 * 4) Add H2O to bring volume to 125 mL