posted by Wanda on .
Describe how you could make 5 mL of 2M potassium hydroxide solution if you have potassium hydroxide pellets available.
You want how many moles KOH? That is M x L = ? moles KOH.
moles KOH = grams KOH/molar mass KOH. YOu know molar mass and moles, solve for grams. A quick note to say that KOH is hygroscopic and it picks up water as well as CO2 from the air; therefore, one can't use KOH as a primary standard because as soon as the new bottle is opened it becomes contaminated with H2O and CO2. The CO2 forms KHCO3 and K2CO3.