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3 years ago

A(n) _____ is a compound that produces hydrogen ions when dissolved in water.

2 answers:

6 0

<span>An acid is a compound that produces hydrogen ions when dissolved in water. The pH of acid is less than 7 because it is rich in H+ concentration. Basic solutions have pH greater than 7 because it is rich in OH-. Neutral solutions meanwhile have pH equal to 7.</span>

yan [13]3 years ago

4 0

Answer: a. acid

Explanation:

a. Acids are those substances which either donates hydrogen ions $(H^+)$ when dissolved in water or accepts a pair of electrons.

$HCl\rightarrow H^++Cl^-$

b. Buffer is a solution which resist changes in pH on addition of small amounts of acid or base into it.

c. Bases are those substances which either donates hydroxide ions $(OH^-)$ when dissolved in water or donates a pair of electrons.

$NaOH\rightarrow Na^++OH^-$

d. Indicators are chemical compounds which show a change or appearance in color at particular pH. Example: litmus

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3 years ago

A chemist prepares a solution of sodium chloride(NaCl) by measuring out 25.4g of sodium chloride into a 100ml volumetric flask a

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Answer: 4 molL-1

Explanation:

Detailed solution is shown in the image attached. The number of moles of NaCl is first obtained. Since the molarity must be in units of molL-1, the volume is divided by 1000 and the formula stated in the solution is applied and the answer is given to one significant figure.

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Which lists the elements in order from least conductive to most conductive?

andreev551 [17]

Answer:

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3 years ago

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Which of the following is not true? a. The freezing point of sea water is lower than the freezing point of pure water. b. The bo

Anna007 [38]

Answer:

The false statement is b.

The boiling point of a water sample from the Salt Lake is lower than the boiling point of pure water

Explanation:

This excersise refers to colligative properties.

Boiling point refers to the property of boiling point elevation. In a solution of ions, as water sea or water from lakes, the boiling point will be higher than water pure.

It is logical to say that, because these sort of water have ions. Remember that colligative properties depends on the solute particles.

T° boiling solution - T° pure solvent = Kb . m . i

In the freezing point depression, we have the oppossite of boiling point elevation. Freezing point of solution is lower than pure solvent, according to this:

T° freezing pure solvent - T° freezing solution = Kc . m . i

We have to always consider the i, which means Van't Hoff factor, number of ions dissolved in solution. As the i is higher, the freezing point of solution will be lower, and the boiling point of solution will be higher.

They are true statement a and c.

In solution of., [NaCl] = 0.1M, as it is a higher concentration, the molality is also higher than a solution of [NaCl] = 0.05.

As water sample form Salt Lake has certain ions, it is logical to say that the boiling point of this water is higher than boiling point of pure water.

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3 years ago

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Answer:

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Explanation:

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2 years ago

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