Take 5.7g of KOH and dissolve in 1dm of water
Dissolve 30 g KOH in 100 mL methanol.
Molarity = moles of solute/Liters of solution ( 220.0 ml = 0.220 Liters ) 0.500 M KOH = moles KOH/0.220 Liters = 0.110 moles KOH (56.108 grams/1 mole KOH) = 6.17 grams solid KOH needed
You weight 14,5 gramm KOH in a bottle and than fill that bottle with deionized water till it holds 500ml.
28 gram. = 2 * 56 * 250 / 1000
What volume(L) of 3M KOH solution can be perpared by diluting 0.5 L of %M KOH solution?
Dissolve 30 g KOH in 100 mL methanol.
Molarity = moles of solute/Liters of solution ( 220.0 ml = 0.220 Liters ) 0.500 M KOH = moles KOH/0.220 Liters = 0.110 moles KOH (56.108 grams/1 mole KOH) = 6.17 grams solid KOH needed
You weight 14,5 gramm KOH in a bottle and than fill that bottle with deionized water till it holds 500ml.
Molarity = moles of solute/liters of solution ( 300 ml = 0.300 liter ) 0.250 molar KOH = moles KOH/0.300 liters = 0.075 moles KOH
28 gram. = 2 * 56 * 250 / 1000
What volume(L) of 3M KOH solution can be perpared by diluting 0.5 L of %M KOH solution?
Molarity = moles of solute/volume of solution 0.500 M KOH = moles KOH/125 ml 62.5 millimoles, or to answer the question precisely, 0.0625 moles KOH
KOH is used to prepare liquid soaps.
Moles KOH = Molarity x Volume = 0.214 moles/liter x 0.0602 liters = 0.0129 moles KOH. Remember, 60.2 mL = 0.062L
because KOH is hygroscopic
1% solution of KOH contains 1g of KOH in 100g of solution. This means that you need to mix 1g of KOH and 99g of water.
The concentration is 1 mol/L or 5,611 g KOH/100 mL solution.