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max2010maxim [7]
3 years ago
14

Can someone please help me ANSWER this question down below?

Chemistry
1 answer:
julsineya [31]3 years ago
4 0

This statement is true

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What is the pH of 10.0 mL solution of 0.75 M acetate after adding 5.0 mL of 0.10 M HCl (assume a Ka of acetic acid of 1.78x10-5)
ValentinkaMS [17]

Answer:

5.90

Explanation:

Initial moles of CH3COO- = 10.0/1000 x 0.75 = 0.0075 mol

Moles of HCl added = 5.0/1000 x 0.10 = 0.0005 mol

CH3COO- + HCl => CH3COOH + Cl-

Moles of CH3COO- left = 0.0075 - 0.0005 = 0.007 mol

Moles of CH3COOH formed = moles of HCl added = 0.0005 mol

pH = pKa + log([CH3COO-]/[CH3COOH])

= -log Ka + log(moles of CH3COO-/moles of CH3COOH)

= -log(1.78 x 10^(-5)) + log(0.007/0.0005)

= 5.90

4 0
3 years ago
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How much time will it take a car travelling at 88 km/hr (55mi/hr)to travel 500km?
dybincka [34]
The time it will take for a car travelling 88 km/hr (55mi/hr) to travel 500km would be 3.5 hours.

How? Add 88 + 58.

That'll equal 143, then divide 500 ÷ 143 = 3.5

So, 3.5 is the time that the car will take travelling 88 km/hr trying to reach the destination of 500km.
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3 years ago
FIRST GETS BRAINLIEST (THE ONE THAT IS CORRECT)
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Answer:

mechanical energy to electrical energy

Explanation:

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The Bohr model of an atom shows a nucleus with electrons circling around it. What does the Bohr model show that makes it a usefu
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Bohr model of an atom illustrates a nucleus with electrons circling around it. This is a useful model for understanding atoms because this clarified that atoms are actually composed of three particles: protons, neutrons and electrons. The first two are located at the center part of an atom (nucleus), while electrons are located at the outer part. Valence electrons of an atom are also vital in the creation of different chemical compounds.
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The a-helices and b- sheets in protein make up its
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