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jek_recluse [69]
4 years ago
8

The Ka of a certain indicator is 4 ×10−7. The color of HIn is green and that of In− is red. A few drops of the indicator are add

ed to an HCl solution, which is then titrated against an NaOH solution. Over which pH range will the indicator change color?
Chemistry
1 answer:
Monica [59]4 years ago
4 0

Answer:

7.4 - 5.4.

Explanation:

The relationship between HIn that is the non-ionized form and the In^-; the ionized form is an equilibrium Reaction which is given below;

HIn(aq) + H2O(l) <--------> H3O^+(aq). + In^-(aq).

From the question, we are given that the ka is 4 ×10^−7, therefore, the mathematical relationship between HIn and In^- is given below;

Ka = [H3O^+] [In^-] / [HIn] = 4 ×10^−7.

The formula we are going to be using to solve this question is given below;

pH = pKa (+ or -) 1.

Recall that the relationship between the ka and pKa;

pKa = - log (ka).

pKa = - log ( 4 ×10^−7).

pKa = 6.4

Therefore, for it to have a distinct color change, the pH range will be;

pH = pKa (+ or -) 1.

pH= 6.4 + 1 = 7.4.

pH= 6.4 - 1 = 5.4.

Hence, the pH range = 7.4 - 5.4.

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Enumerate any two differences between simple distillation and fractional distillation.
mr_godi [17]

Answer:

Explanation:

By simple distillation, we can separate tow miscible liquids having sufficient difference in their boiling points.

By fractional distillation, we can separate the mixture of two or more miscible liquids for which the difference in their boiling point is less than 25k

Simple distillation is done using an air condenser or water condenser.

Fractionating column is fitted in between the distillation flask and the condenser for the process.

Simple distillation eg: mixture of water and acetone

fractional distillation eg: crude oil

hope this helps

plz mark as brainliest!!!!!!

7 0
3 years ago
Read 2 more answers
How can water and gravity work together to erode soil,sediment,and rock
Sunny_sXe [5.5K]
Ever seen a waterfall ? what do you think happens when all that water slams into the ground below ? same as when you turn a hosepipe on a flowerbed.

also, there's hydraulic cracking where water gets into cracks and freezes, splitting rocks apart.

fast moving water can carry sediment and roll rocks along the bottom. if the water slows down, it drops the rocks and heavier sediment. if it floods a field, say, then drains away, the grass will also filter smaller particles out, or the water might evaporate and leave fine sediment behind.
6 0
4 years ago
Read 2 more answers
U test a substance using red litmus paper turns blue based on these results is the substance acidic or base
Blizzard [7]

Answer:

basic in nature

Explanation:

Litmus Test -

It is the very basic test , used to determine if the solution is acidic in nature or is basic in nature .

There are two type of litmus paper available , i.e. , blue and red .

  • If the solution is acidic in nature ,

putting a blue litmus paper turns red ,

and putting a red litmus paper would not show any change .

And , hence it can be concluded that the solution is acidic in nature .

Similarly ,

  • If the solution is basic in nature ,

putting a red litmus paper turn blue ,

and putting a blue litmus paper would not show any change .

And , hence it can be concluded that the solution is basic in nature .

6 0
4 years ago
What volume of methanol should be used to make 1.25 L of a 21.0% by volume solution?<br> ___ mL
Pie

Answer:

  262.5 mL

Explanation:

21% of the 1.25 L volume is methanol, so the required amount of methanol is ...

  0.21 × 1250 mL = 262.5 mL

4 0
3 years ago
What is the name of the acid formed when h2s gas is dissolved in water?
Serjik [45]
The name of the acid that is formed when hydrogen sulfide is dissolved in water would be hydrosulfuric acid. It has the same chemical formula as hydrogen sulfide which is H2S. It is classified as a weak acid which partially ionizes into hydrogen sulfide ions and hydronium ions. It is a very toxic substance and is distinguished by its strong odor which is compared to an egg that is rotting. It can be found in high concentrations in the crust of the Earth, in volcanic emissions and in many fossil fuels. To produce this acid, the gas hydrogen sulfide is dissolved into the water. However, this acid is not produced since it does not have any industrial application.
6 0
3 years ago
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