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melisa1 [442]
2 years ago
6

A sample of river water taken near a factory shows pH 5. Does this represent a pollution problem?

Chemistry
1 answer:
melomori [17]2 years ago
3 0

Yes because a pH below 7 is acidic and that means that there is pollution

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Acetic acid is a weak acid with a pKa of 4.76. What is the concentration of acetic acid in a buffer solution of 0.2M at pH 4.9.
masya89 [10]

Answer:

0.084 M

Explanation:

Using the Henderson-Hasselbalch equation for a buffer ( a buffer is solution contain a weak acid and it conjugate base; the solution resist change in pH)

pH = pKa + log ( base/acid)

4.9 - 4.76 =log ( base / acid)

10^0.14 =  ( base / acid)

1.38 = (base / acid)

since there is 0.2 M in the buffer solution

the concentration of acid =  \frac{1}{(1+1.38)} × 0.2 = 0.084 M

6 0
3 years ago
Two students in the same class find that a piece of wood,
Naily [24]

Answer:

The wood is oak.

Explanation:

Given data:

Mass of wood = 70 g

Volume of wood = 103 cm³

Wood is oak = ?

Solution:

We will calculate the density of wood then we will compare it with literature value.

Density = mass/ volume

d = 70 g/ 103 cm³

d = 0.68 g/cm³

The density of oak is 0.59 - 0.90 g/cm³.

So its true, wood is oak.

5 0
3 years ago
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alina1380 [7]

Answer:

1st page, number a-ENergy is added or absorbed

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3 years ago
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mihalych1998 [28]

0! because you walked back in forth in diferent direcions

8 0
3 years ago
If a 200 g piece of aluminum has a density of 5.0 g/cm^3. what is its volume?​
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Volume=mass in g /density

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2 years ago
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