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Scorpion4ik [409]
3 years ago
15

What is the ph of a solution of 0.50 m acetic acid?

Chemistry
1 answer:
frosja888 [35]3 years ago
6 0
You need to use the Ka for the acetic acid and the equilibrium equation.

Ka = 1.85 * 10^ -5

Equilibrium reaction: CH3COOH (aq) ---> CH3COO(-) + H(+)

Ka = [CH3COO-][H+] / [CH3COOH]

Molar concentrations at equilibrium

CH3COOH         CH3COO-     H+

 0.50  - x                  x                 x

Ka = x*x / (0.50 - x) = x^2 / (0.50 - x)

Given that Ka is << 1 => 0.50 >> x and 0.50 - x ≈ 0.50

=> Ka ≈ x^2 / 0.50

=> x^2 ≈ 0.50 * Ka = 0.50 * 1.85 * 10^ -5 = 0.925 * 10^ - 5 = 9.25 * 10 ^ - 6

=> x = √ [9.25 * 10^ -6] = 3.04 * 10^ -3 ≈ 0.0030

pH = - log [H+] = - log (x) = - log (0.0030) = 2.5

Answer: 2.5
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The answer is False.
8 0
3 years ago
The dimensions of a rectangular solid are measured to be 1.27 cm, 1.3 cm, and 2.5 cm. The volume should be recorded as
meriva

Answer: 4.1 cm3

Explanation:

5 0
2 years ago
How many Na ions are in 2.7 g of NaCl?<br> Answer in units of ions.
Viefleur [7K]

Answer:

2.778 * 10^{22}

Explanation:

Weight of NaCl is equal to sum of weight of one mole of sodium and one mole of chloride.

Mathematically, it can be represented as -

1 mol (Na) + 1 mol (Cl) = 23.0  + 35.5  = 58.5 g/mol

In 58.5 gram of NaCl, there is one mole of Na or 6.02 * 10^{23} ions

In one gram of NaCl, there will be

\frac{6.02 * 10^{23}}{58.5} sodium ions

In 2.7 grams of  NaCl, the number of sodium ions will be -

\frac{6.02 * 10^{23}}{58.5} * 2.7

2.778 * 10^{22}

3 0
3 years ago
HELP PLEASEE
GarryVolchara [31]

Answer:

Let's start with the fact that cereals , are made of grains and are mostly carbohydrates. therefore they contain carbon oxygen and hydrogen. They also contain proteins so have nitrogen. Plants have the minerals that are in the soil where they grow, so the list you have is correct. They also generally have added vitamins ad minerals. The vitamins contain C, H, O N, and a few others such as sulfur, The added minerals might contain:copper, iron, zinc, cobalt, selenium, silicon and molybdenum .

Mark me as brainliest if it was helpful

4 0
3 years ago
How do you do this problem?
Svetradugi [14.3K]

Answer:

B

Explanation:

If the temperature of the water goes up, the reaction is exothermic (heat is being given away by the equation -- more precisely the reactants of the equation). Only A and B can be true. In order for the reaction to occur, the water has to absorb the heat. It's temperature goes up. Remember that minus sign. It is almost the key fact for this question.

The question is not as hard as it looks, but that is easy for me to say.

m = 100 g

c = 4.2 J/(g * oC)

deltaT = 21 - 20 degrees = 1 degree.

Heat = 100 * 4.2 * 1

Heat = 420 J

Heat = 420 * [1 kJ/1000 J]

Heat = -0.42 kJ

B

8 0
3 years ago
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