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tatuchka [14]
3 years ago
12

Muscle physiologists study the accumulation of lactic acid [CH3CH(OH)COOH] during exercise. Food chemists study its occurrence i

n sour milk, beer, wine, and fruit. Industrial microbiologists study its formation by various bacterial species from carbohydrates. A biochemist prepares a lactic acid-lactate buffer by mixing 225 mL of 0.85 M lactic acid (Ka = 1.38 × 10−4) with 435 mL of 0.68 M sodium lactate. What is the buffer pH?
Chemistry
1 answer:
Alexus [3.1K]3 years ago
3 0

Answer:

4.1

Explanation:

First, we will calculate the moles of each species.

  • Lactic acid: 0.225 L × 0.85 mol/L = 0.19 mol
  • Lactate: 0.435 L × 0.68 mol/L = 0.30 mol

The volume of the mixture is 0.225 L + 0.435 L = 0.660 L

The concentration of the species in the buffer are:

  • Lactic acid: 0.19 mol/0.660 L = 0.29 M
  • Lactate: 0.30 mol/0.660 L =0.45 M

We can find the pH of the buffer using the Henderson-Hasselbach equation.

pH = pKa + log [lactate] / [lactic acid]

pH = -log 1.38 × 10⁻⁴ + log 0.45 M / 0.29 M

pH = 4.1

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a saturated solution of Cu(IO3)2 was prepared in 0.0250 M KIO3. The copper concentration was found to be 0.00072 M. Set up an IC
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Answer:

\large \boxed{\text{0.0264 mol/L; }5.0 \times 10^{-7}}

Explanation:

1. The ICE table

\begin{array}{rccccc} &\text{Cu}\text{(IO}_{3})_{2} & \rightleftharpoons &\text{Cu}^{2+}&+ & 2\text{IO}_{3}^{-}\\\\\text{I:}& & & 0 & & 0.0250\\\text{C:}& & & +x & & x \\\text{E:}& & & x & &0.0250 + 2x\\\end{array}

2. Concentration of IO₃⁻

At equilibrium, [Cu²⁺] = 0.000 72 mol·L⁻¹, so x = 0.000 72.

The new ICE table becomes

\begin{array}{rccccc} &\text{Cu}\text{(IO}_{3})_{2} & \rightleftharpoons &\text{Cu}^{2+}&+ & 2\text{IO}_{3}^{-}\\\\\text{I:}& & & 0 & & 0.0250\\\text{C:}& & & +0.00072 & & 0.00144 \\\text{E:}& & & 0.00072 & & \mathbf{0.0264}\\\end{array}\\\text{The equilibrium concentration of iodate ion is $\large \boxed{\textbf{0.0264 mol/L}}$}

3. Ksp

K_{\text{sp}} = [\text{Cu}^{2+}][\text{IO}_{3}^{-}]^{2} = 0.00072 \times 0.0264^{2} = \mathbf{5.0 \times 10^{-7}}

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<h3>What is no cell phone policy?</h3>

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Cell phone policies is a set of guidelines regarding use of cellphone in the workplace. The employees of that workplace should be  read cell phone policies before joining.

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Therefore, A flexible mind help you become a better employee as it helps you learn new things that will better your performance. Thus, option C is correct.

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