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sasho [114]
3 years ago
11

An unknown solution has a pH of 7. how would you classify this solution?

Chemistry
2 answers:
Mrac [35]3 years ago
7 0

Answer:

Option A. neutral

Explanation:

we know that

The pH is a number that describe the concentration of hydrogen ions in the solution. A solution's pH will be a number between 0 and 14.

A solution with a pH of 7 is classified as neutral.  (pH=7)

If the pH is lower than 7, the solution is acidic.  (pH < 7)

If the  pH is higher than 7, the solution is basic.  (pH > 7)

In this problem we have a solution that has a pH=7

therefore

The solution is classified as neutral

aksik [14]3 years ago
7 0

<u>Answer:</u> The correct answer is Option A.

<u>Explanation:</u>

pH is defined as the negative logarithm of hydrogen ion concentration present in the solution.

Mathematically,

pH=-\log [H^+]

  • If the solution has high hydrogen ion concentration, then the pH will be low and the solution will be acidic. The pH range of acidic solution is 0 to 6.9
  • If the solution has low hydrogen ion concentration, then the pH will be high and the solution will be basic. The pH range of basic solution is 7.1 to 14
  • The solution having pH equal to 7 is termed as neutral solution.

Hence, the correct answer is Option A.

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Answer:

[HAc] = 0.05M

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Explanation:

The Henderson-Hasselbalch formula for the acetic acid buffer is:

pH = pka + log₁₀ [Ac⁻] / [HAc]

Replacing:

5.36 = 4.76 + log₁₀ [Ac⁻] / [HAc]

3.981 = [Ac⁻] / [HAc] <em>(1)</em>

Also, as total concentration of buffer is 0.25M it is possible to write:

0.25M =  [Ac⁻] + [HAc] <em>(2)</em>

Replacing (2) in (1)

3.981 = 0.25M - [HAc] / [HAc]

3.981 [HAc] = 0.25M - [HAc]

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4 years ago
Analyze the following reaction and the given scenarios to discuss the relationship between volume and reaction rate. Determine w
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The second reaction with the volume of 5L will occur faster as compared to the first reaction of volume 10L.

Volume is inversely proportional to the rate of reaction.

As volume increases rate of reaction decreases and as volume decreases rate of reaction increases.

Let's consider a reaction A   →  B.

r is rate of reaction and K is rate constant, A is the concentration of reaction.

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r is directly proportional to the A.

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The question has missing information, the complete question is:

Cobalt(II) chloride forms several hydrates with the general formula CoCl₂.xH₂O, where x is an integer. If the hydrate is heated, the water can be driven off, leaving pure CoCl₂ behind. Suppose a sample of a certain hydrate is heated until all the water is removed, and it's found that the mass of the sample decreases by 22.0%. Which hydrate is it? That is, what is x?

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