Chemistry, 02.03.2020 17:04 xolocsin

Write the chemical equations involved in this experiment and how that the rate of disappearance of [S2O8^2-] is proportional to the rate of appearance of the blue-black color of the starch-iodine complex.

Answers: 1

Show answers

Answers

Answer from: juanmias

The rate of appearance of blue black color has been proportional to the persulfate ion, as the rate of reaction has been dependent on the reactant concentration.

The reaction for the consumption of iodine has been given as:

$\rm H_2O_2\;+\;2\;I^-\;+\;2\;H^+\;\rightarrow\;I_2\;+\;2\;H_2O\\2\;S_2O_3^2^-\;+\;I_2\;\rightarrow\;S_4O_6^2^-\;+\;2\;I^-$

The reaction has been mediated by the addition of persulfate in the reaction that results in the formation of iodine. The iodine reacting with the starch has been forming the blue-black color complex.

The iodine formation for the reaction has been based on the presence of persulfate.

Thus, the higher the concentration of persulfate in the reaction, the higher will be the iodine reactant resulting in the lesser blue-black color complex. Therefore with decrease in persulfate, more iodine will be available resulting in the blue black complex.

For more information about rate of reaction, refer to the link:

link

Answer from: goblebrandon

S₂O₈²⁻

(aq) + 2I⁻

(aq) → I₂(aq) + 2SO₄

²⁻(aq)

2S₂O₃²⁻

(aq) + I₂(aq) → S₄O₆²⁻

(aq) + 2I⁻

(aq)

Explanation:

S₂O₈²⁻

(aq) + 2I⁻

(aq) → I₂(aq) + 2SO₄

²⁻(aq)

To measure the rate of this reaction we must measure the rate of concentration change of one of the reactants or products. To do this, we will include (to the reacting S₂O₈

²⁻ and I⁻

i) a small amount of sodium thiosulfate, Na₂S₂O₃,

ii) some starch indicator.

The added Na₂S₂O₃ does not interfere with the rate of above reaction, but it does consume the I₂ as soon as it is formed.

2S₂O₃²⁻

(aq) + I₂(aq) → S₄O₆²⁻

(aq) + 2I⁻

(aq)

This reaction is much faster than the previous, so the conversion of I2 back to I⁻ is essentially instantaneous.

$rate = \frac{dI2}{dt} = \frac{1/2 [S2O3^2^-]}{t}$

Answer from: Quest

Sorry i don’t know i just need the points

Answer from: Quest

C. which metal is less dense

Another question on Chemistry

Chemistry, 21.06.2019 15:00

Which element in the third period would you expect to have the larger atomic radius, sodium (na) or sulfur (s)? a. sodium, because it has a higher effective nuclear charge attracting electrons in fewer energy levels. b. sodium, because it has fewer protons attracting electrons in the same energy levels. c. sulfur, because it has more protons attracting electrons in more energy levels. d. sulfur, because it has a higher effective nuclear charge attracting electrons in the same energy levels.

Answers: 2

Answer

Chemistry, 22.06.2019 08:00

What is the molarity of 60.0 grams of naoh dissolved in 750 milliliters of water? a) 1.1 m b) 2.0 m c) 12 m d) 75 m

Answers: 1

Answer

Chemistry, 22.06.2019 10:10

For the reaction, 4 a(g) + 3 b(g) => 2 c(g), the following data were obtained at constant temperature. experiment initial[a],mol/l initial [b],mol/l initial rate,m/min 1 0.200 0.150 5.00 2 0.400 0.150 10.0 3 0.200 0.300 10.0 4 0.400 0.300 20.0 which of the following is the correct rate law for the reaction? 1. rate = k[a]2[b]2 2. rate = k[a][b] 3. rate = k[a]2[b] 4. rate = k[a][b]2

Answers: 3

Answer

Chemistry, 22.06.2019 11:00

What is the molar mass of a gas that has density of 2.054 g/l

Answers: 2

Answer

You know the right answer?

Write the chemical equations involved in this experiment and how that the rate of disappearance of [...

Questions