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elena-s [515]
2 years ago
15

1) A solution is prepared with 0.55 M HNO2 and 0.75 M KNO2. Fill in the ICE Table with the appropriate values

Chemistry
1 answer:
Slav-nsk [51]2 years ago
4 0

Based on the calculations through the ICE table, the pH of the buffer solution is equal to 3.30.

<u>Given the following data:</u>

  • Concentration of HNO_2 = 0.55 M.
  • Concentration of KNO_2 = 0.75 M.
  • Rate constant = 6.8 \times 10^{-4}

<h3>How to determine the pH of the buffer solution.</h3>

First of all, we would write the properly balanced chemical equation for this chemical reaction:

                                     HNO_2(aq)\rightleftharpoons H^{2+} (aq)+ KNO_2^{-}(aq)

Initial cond.                       0.55M              0          0.75M

    \Delta C                                   -x                   x               x

At equib.                           0.55M - x         0 + x      0.75M + x

From the ICE table, the Ka for this chemical reaction is given by:

K_{a}=\frac{[H^+][NO_2^+]}{HNO_2} \\\\H^+ = K_{a}\frac{[HNO_2]}{[NO_2^+]} \\\\H^+ =  6.8 \times 10^{-4} \times \frac{0.55}{0.75} \\\\H^+ =  6.8 \times 10^{-4} \times 0.733\\\\H^+ = 4.98 \times 10^{-4} \;M

Now, we can calculate the pH of the buffer solution:

pH=-log[H^+]\\\\pH=-log[4.98 \times 10^{-4}]\\\\pH=-(-3.30)

pH = 3.30.

Alternatively, you can calculate the pH of this buffer solution by applying Henderson-Hasselbalch equation:

pH =pka+ log_{10} \frac{A^-}{HA}

<u>Where:</u>

  • HA is acetic acid.
  • A^-  is acetate ion.

Read more on concentration here: brainly.com/question/3006391

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A sample of vinegar was found to have an acetic acid concentration of 0.8846 m. What is the acetic acid % by mass? Assume the de
jenyasd209 [6]

Answer:

5.3%

Explanation:

Let the volume be 1 L

volume , V = 1 L

use:

number of mol,

n = Molarity * Volume

= 0.8846*1

= 0.8846 mol

Molar mass of CH3COOH,

MM = 2*MM(C) + 4*MM(H) + 2*MM(O)

= 2*12.01 + 4*1.008 + 2*16.0

= 60.052 g/mol

use:

mass of CH3COOH,

m = number of mol * molar mass

= 0.8846 mol * 60.05 g/mol

= 53.12 g

volume of solution = 1 L = 1000 mL

density of solution = 1.00 g/mL

Use:

mass of solution = density * volume

= 1.00 g/mL * 1000 mL

= 1000 g

Now use:

mass % of acetic acid = mass of acetic acid * 100 / mass of solution

= 53.12 * 100 / 1000

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3 0
3 years ago
The balanced equation for a hypothetical reaction is a + 5b + 6c → 3d + 3e. what is the rate law for this reaction? rate = k [a]
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<u>Answer: </u>The correct rate of the reaction is Rate=k[a][b]^5[c]^6

<u>Explanation:</u>

Rate law of the reaction is the expression which expresses the rate of the reaction in the terms of the molar concentrations of the reactants with each term raised to the power of their respective stoichiometric coefficients in a balanced chemical equation.

For the given reaction:

a+5b+6c\rightarrow 3d+3e

The expression for the rate law will be: Rate=k[a][b]^5[c]^6

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3 years ago
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