A chemist dissolves 382. mg of pure sodium hydroxide in enough water to make up 70. mL of solution. Calculate the pH of the solution. (The temperature of the solution is 25 °C.) Round your answer to 2 significant decimal places.
A chemist dissolves 382. mg of pure sodium hydroxide in enough water to make up 70. mL of solution. Calculate the pH of the solution. (The temperature of the solution is 25 °C.) Round your answer to 2 significant decimal places.
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Transcribed Image Text:A chemist dissolves 382. mg of pure sodium hydroxide in enough water to make up 70. mL of solution. Calculate the pH of the solution. (The temperature of the
solution is 25 °C.)
Round your answer to 2 significant decimal places.
Expert Solution
Step 1
Solution :
We need to calculate the molarity of the solution first
1M NaOH=40g of NaOH in 1 L of solution
70 mL= 0.07L of NaOH solution
0.382 g of NaOH is 0.382g/40g/mole= 0.00955 moles of NaOH per 0.07L=0.136mole/L=136 mol/m3
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