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pH Worksheet Solutions: Finding pH and pOH of Various Acidic and Basic Solutions, Slides of Engineering

Avans HogeschoolEngineering

Solutions to various ph calculation problems involving the determination of ph and poh for hydroiodic acid, sodium hydroxide, diluted nitric acid, and a solution containing hydrochloric acid and nitrous acid.

Typology: Slides

2021/2022

Uploaded on 07/04/2022

NicolaasNik
NicolaasNik 🇳🇱

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pH worksheet 2
W 334
Everett Community College Tutoring Center
Student Support Services Program
1) Find the pH of a 9.8 x 10-4 M HI solution.
2) Find the pH of a 2.76 x 10-4 M NaOH solution. (Hint: this is a basic solution –
concentration is of OH -)
3) Find the pH of a solution made by diluting 35 mL of 4.5 M HNO3 to a final volume of
2.25 L.
4) Find the pH of 4.75 L of an aqueous solution that contains 3.20 grams of HCl and 1.85
grams of nitrous acid.
5) Find the pOH’s for the solutions in problems 1 – 4 above:
#1) ___________________________
#2) ___________________________
#3) ___________________________
#4) ___________________________
pf2

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Download pH Worksheet Solutions: Finding pH and pOH of Various Acidic and Basic Solutions and more Slides Engineering in PDF only on Docsity!

pH worksheet 2 W 334

Everett Community College Tutoring Center Student Support Services Program

  1. Find the pH of a 9.8 x 10-4^ M HI solution.

  2. Find the pH of a 2.76 x 10-4^ M NaOH solution. (Hint: this is a basic solution – concentration is of OH - )

  3. Find the pH of a solution made by diluting 35 mL of 4.5 M HNO 3 to a final volume of 2.25 L.

  4. Find the pH of 4.75 L of an aqueous solution that contains 3.20 grams of HCl and 1. grams of nitrous acid.

  5. Find the pOH’s for the solutions in problems 1 – 4 above:

#1) ___________________________

#2) ___________________________

#3) ___________________________

#4) ___________________________

Solutions

Note: The significant figures in the concentration of [H+] or [OH - ] is equal to the

number of decimal places in the pH or pOH and vice versa.

  1. Find the pH of a 9.8 x 10-4^ M HI solution.

pH = -log (9.8 x 10-4) = 3.

  1. Find the pH of a 2.76 x 10-4^ M NaOH solution.

pOH = -log (2.76 x 10-4) = 3. pH = 14.000 – 3.559 = 10.

  1. Find the pH of a solution made by diluting 35 mL of 4.5 M HNO 3 to a final volume of 2.25 L.

M 1 V 1 = M 2 V 2

M 2 = M 1 V 1 = (4.5 M)(35 mL) = 0.070 M V 2 (2250 mL)

pH = -log (0.070) = 1.

  1. Find the pH of 4.75 L of an aqueous solution that contains 3.20 grams of HCl and 1. grams of nitrous acid. 3.20 g HCl x 1 mole HCl = 0.0878 mole HCl 36.45 g HCl 1.85 g HNO 2 x 1 mole HNO 2 = 0.0394 mole HNO 2 47 g HNO 2 0.0878 mole HCl + 0.0394 mole HNO 2 = 0.1272 moles acid 0.1272 moles acid = 0.0268 M acid solution 4.75 L H 2 O pH = -log (0.0268) = 1.

  2. Find the pOHs for the solutions in problems 1 – 4 above:

#1) pOH = 14.00 – 3.01 = 10.

#2) pOH = 3.

#3) pOH = 14.00 – 1.15 = 12.

#4) pOH = 14.000 – 1.572 = 12.