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Home 〉 Chemistry for Biochemists 〉 Acid & Base Chemistry 〉 Practice Set 1

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Please learn: Definitions of Ka, pKa, pH, pOH

Q1.1: Using the symbols HZ for Brønsted-Lowry acid & B− for Brønsted-Lowry base, write equations which show the following substances acting as both Brønsted-Lowry bases & Brønsted-Lowry acids.

a) NH3 + ? ⟶ ? + ?

b) CH3OH + ? ⟶ ? + ?

10:19 - 13:55

Q1.1: Using the symbols HZ for Brønsted-Lowry acid & B− for Brønsted-Lowry base, write equations which show the following substances acting as both Brønsted-Lowry bases & Brønsted-Lowry acids.

a) NH3 + ? ⟶ ? + ?

b) CH3OH + ? ⟶ ? + ?

10:19 - 13:55

Q3: Calculate the [OH-] concentration of a solution in which the pH is 4.0.

0:00 - 3:33

Q4.1: What is the pH of a buffer solution that is 0.24 M NH₃ and 0.20 M NH₄CI? (Kₐ of NH₄⁺ = 5.6 × 10⁻¹⁰)

0:00 - 2:49

Q4.2: If 0.005 mol of NaOH is added to 0.50 L of the buffer solution (0.24 M NH₃ and 0.20 M NH₄CI), what is the resulting pH?

2:49 - 7:15

Q4.3: If 0.03 mol of HCl is added to 0.50 L of the buffer solution (0.24 M NH₃ and 0.20 M NH₄CI), what is the resulting pH?

7:15 - 11:38

Q2:

Water is important because it's weird - what makes it so weird is its unique (and very useful) properties. These properties are used by living organisms for example, playing key roles in many of the human body's functions such as bringing nutrients to cells, getting rid of wastes, protecting joints and organs, and maintaining body temperature.

So what specifically makes water so crucial for the formation of life?

Q3:

Water is important because it's weird - what makes it so weird is its unique (and very useful) properties. These properties are used by living organisms for example, playing key roles in many of the human body's functions such as bringing nutrients to cells, getting rid of wastes, protecting joints and organs, and maintaining body temperature.

So what specifically makes water so crucial for the formation of life?

Q4:

Water is important because it's weird - what makes it so weird is its unique (and very useful) properties. These properties are used by living organisms for example, playing key roles in many of the human body's functions such as bringing nutrients to cells, getting rid of wastes, protecting joints and organs, and maintaining body temperature.

So what specifically makes water so crucial for the formation of life?

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There are no more questions, there may be questions added in the future, however i am very busy with education.

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Reference List

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• Questions 4.1-4.3: Khan Academy Organic Chemistry (2014). Buffer solution pH calculations | Chemistry | Khan Academy. YouTube. Available at: https://www.youtube.com/watch?v=lsHq5aqz4uQ [Accessed 12 Jan. 2025].

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