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3 years ago

Help please I'll mark you as a brainliest promise.

Chemistry

1 answer:

antiseptic1488 [7]3 years ago

5 0

Answer:

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Explanation:is this what you meant?

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What is the pH of a solution that contains 0.83M HCN (Ka = 4.9x10-10) and 0.64 M potassium cyanide?

oksian1 [2.3K]

Answer:

pH= 9.2

Explanation:

Henderson hasselbach equation

pKa= log Ka= log (4.9 x 10^-10)=9.3

$pH=Pka+log \frac{[A-]}{[HA]}$

$pH=9.3+log \frac{[CN-]}{[HCN]}$

$pH=9.3+log \frac{[0.64 M]}{[0.83 M]}$

pH= 9.2

5 0

3 years ago

A solid mixture consists of 47.6g of KNO3 (potassium nitrate) and 8.4g of K2SO4 (potassium sulfate). The mixture is added to 130

IgorLugansk [536]

Answer: No crystals of potassium sulfate will be seen at 0°C for the given amount.

Explanation:

We are given:

Mass of potassium nitrate = 47.6 g

Mass of potassium sulfate = 8.4 g

Mass of water = 130. g

Solubility of potassium sulfate in water at 0°C = 7.4 g/100 g

This means that 7.4 grams of potassium sulfate is soluble in 100 grams of water

Applying unitary method:

In 100 grams of water, the amount of potassium sulfate dissolved is 7.4 grams

So, in 130 grams of water, the amount of potassium sulfate dissolved will be $\frac{7.4}{100}\times 130=9.62g$

As, the soluble amount is greater than the given amount of potassium sulfate

This means that, all of potassium sulfate will be dissolved.

Hence, no crystals of potassium sulfate will be seen at 0°C for the given amount.

7 0

3 years ago

Which pair of concentrations results in the most effective buffer? Which pair of concentrations results in the most effective bu

SOVA2 [1]

The pair that results in the most effective buffer is .50 M Ha and .50 M A-.

A buffer's capacity is the pH range where it works as an effective buffer, preventing large changes in pH upon addition of an acid or base.

The correct answer between all the choices given is the second choice or letter B. I am hoping that this answer has satisfied your query and it will be able to help you in your endeavor, and if you would like, feel free to ask another question.

7 0

3 years ago

Which of the following is an input for cellular respiration? a. CO2 b. H2O c. sunlight d. O2 Please select the best answer from

Westkost [7]

The output CO2 but the input is O2
hope it helps

5 0

3 years ago

Read 2 more answers

How many moles are in 5g of NaOH

Lady bird [3.3K]

5g NaOH x 1 mol NaOH/ 39.99g NaOH = 0.125 mol NaOH

7 0

4 years ago

Read 2 more answers

Help please I'll mark you as a brainliest promise.​

Help please I'll mark you as a brainliest promise.