Question

1. Calculate how many milliliters (mL) of 2 M NaOH will be needed to make 0.50 L of a 0.2 M aqueous NaOH solution. 2. You will use a weighted amount of KHP (a weak acid) to standardize your ~ 0.2 M NaOH solution. Assuming that you made exactly 0.2 M NaOH, calculate how many grams of KHP will react with exactly 15 mL of 0.2 M NaOH. Use the information below to help answer this question: _C02 K+ CO2 K+ + NaOH = + H2O COZH CO, Nat KHP The rxn between KHP and NaOH occurs at a 1:1 ratio MW of KHP = 204.22 g/mol

Answer 1

1)

use dilution formula

M1*V1 = M2*V2

1---> is for stock solution

2---> is for diluted solution

Given:

M1 = 2 M

M2 = 0.2 M

V2 = 0.50 L = 500 mL

use:

M1*V1 = M2*V2

V1 = (M2 * V2) / M1

V1 = (0.2*500)/2

V1 = 50 mL

Answer: 50 mL

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