A. Calculate the mass of NaOH needed to prepare 100ml of 0.20 molar
solution.
mols NaOH needed = M x L = 0.20 x 0.1 = 0.020 mols.
grams = mols x molar mass = 0.020 x approx 40 = about 0.80 grams. I'm estimating so you must reconfirm all of these numbers.
B. Calculate the mass of solid KHP needed to react completely with 25ml of a 0.20m NaOH solution.
You MUST mean 0.20 M and not m. M stands for molarity; m stands for molality. NaOH + KHP ==> NaKP + H2O
mols NaOH = M x L = 0.20 x 0.025 = 0.005
The equation tells you that 1 mol NaOH reacts with 1 mol KHP; therefore, mols KHP reacted must be 0.005.
Then grams KHP = mols KHP x molar mass KHP = ?
C. Calculate the molar amount of solid KHP used to neutralize the NaOH solution.
I did that in part B above
Post your work if you have any questions.
Calculate the mass of NaOH needed to prepare 100ml of 0.20molar solution.
B. Calculate the mass of solid KHP needed to react completely with 25ml of a 0.20m NaOH solution.
C. Calculate the molar amount of solid KHP used to neutralize the NaOH solution.
1 answer
2 answers