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3 years ago

Where is the Center of the Universe?

Chemistry

2 answers:

Alex17521 [72]3 years ago

8 0

Everywhere

Hope that helps and good luck

~May

yanalaym [24]3 years ago

3 0

There is no center of the universe, the universe has been expanding.

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At which part of a river would you have the best luck growing food?

krek1111 [17]

Answer:

B. Delta

Explanation:

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3 years ago

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Calculate the ph of a dilute solution that contains a molar ratio of potassium acetate to acetic acid (pka ???? 4.76) of (a) 2:1

givi [52]

According to Hasselbach-Henderson equation:

$pH=pK_{a}+log\frac{[A^{-}]}{[HA]}$

Here, $[A^{-}]$ is concentration of conjugate base and [HA] is concentration of acid.

In the given problem, conjugate base is $CH_{3}COOK$ and acid is $CH_{3}COOH$ thus, Hasselbach-Henderson equation will be as follows:

$pH=pK_{a}+log\frac{[CH_{3}COOK]}{[CH_{3}COOH]}$ ...... (1)

(a) Ratio of concentration of potassium acetate and acetic acid is 2:1 thus,

$\frac{[CH_{3}COOK]}{[CH_{3}COOH]}=2$

Also, $pK_{a}=4.76$

Putting the values in equation (1),

$pH=4.76+log\frac{2}{1}=5.06$

Therefore, pH of solution is 5.06.

(b) Ratio of concentration of potassium acetate and acetic acid is 1:3 thus,

$\frac{[CH_{3}COOK]}{[CH_{3}COOH]}=\frac{1}{3}$

Also, $pK_{a}=4.76$

Putting the values in equation (1),

$pH=4.76+log\frac{1}{3}=4.28$

Therefore, pH of solution is 4.28.

(c)Ratio of concentration of potassium acetate and acetic acid is 5:1 thus,

$\frac{[CH_{3}COOK]}{[CH_{3}COOH]}=\frac{5}{1}$

Also, $pK_{a}=4.76$

Putting the values in equation (1),

$pH=4.76+log\frac{5}{1}=5.45$

Therefore, pH of solution is 5.45.

(d) Ratio of concentration of potassium acetate and acetic acid is 1:1 thus,

$\frac{[CH_{3}COOK]}{[CH_{3}COOH]}=1$

Also, $pK_{a}=4.76$

Putting the values in equation (1),

$pH=4.76+log\frac{1}{1}=4.76$

Therefore, pH of solution is 4.76.

(e) Ratio of concentration of potassium acetate and acetic acid is 1:10 thus,

$\frac{[CH_{3}COOK]}{[CH_{3}COOH]}=\frac{1}{10}$

Also, $pK_{a}=4.76$

Putting the values in equation (1),

$pH=4.76+log\frac{1}{10}=3.76$

Therefore, pH of solution is 3.76.

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3 years ago

Which of the solutions has the highest concentration? (Don't Have To Answer Why)

grigory [225]

Answer:

Explanation:

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3 years ago

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What does the latent heat of vaporization measure?

Yuki888 [10]

Answer: D. The energy required to boil a substance

Explanation: I just took the quiz and got it correct :)

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3 years ago

How many moles of ammonia would be required to react exactly with 0.870 moles of copper(II) oxide in the following chemical reac

never [62]

Answer:

Simple Stoich Question

Explanation:

0.870 moles divided by 3 mol ratio of CuO, multiplied by 2 mol ratio of NH3 (ammonia)

$\frac{0.870}{3 } * 2 = 0.58 \ moles \ of \ Ammonia$

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3 years ago