To determine the amount of KOH needed to make a 1 molar solution in 1 liter, we need to calculate the molar mass of KOH and then use the concentration formula.
The molar mass of KOH can be calculated by adding the atomic masses of potassium (K), oxygen (O), and hydrogen (H) together:
K: 39 g/mol
O: 16 g/mol
H: 1 g/mol
Molar mass of KOH = 39 g/mol + 16 g/mol + 1 g/mol = 56 g/mol
Now, we can use the concentration formula:
Concentration (in moles/Liter) = Amount of solute (in moles) / Volume of solution (in liters)
Since we want to make a 1 molar solution, the concentration is 1 mole/Liter. The volume of the solution is also given as 1 liter. Therefore, we can rearrange the formula to find the amount of solute (in moles):
Amount of solute (in moles) = Concentration (in moles/Liter) x Volume of solution (in liters)
Amount of solute (in moles) = 1 mole/Liter x 1 liter = 1 mole
To convert the amount of solute from moles to grams, we can use the molar mass of KOH:
Amount of solute (in grams) = Amount of solute (in moles) x Molar mass of KOH
Amount of solute (in grams) = 1 mole x 56 g/mol = 56 grams
Therefore, to make a 1 molar solution of KOH in 1 liter, we need to add 56 grams of KOH.