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PilotLPTM [1.2K]
3 years ago
10

How do I convert 4,500mm to a m

Chemistry
1 answer:
marissa [1.9K]3 years ago
6 0
K h d m d c m

If you move the decimal from the very right m (mm) to the left until you get to the middle m (meters) you have your answer.

You would move the decimal 3 times to the left because it is going from small to big so the number gets smaller. The answer is simply 4.5 m. You can use this tool with any of the units (liter, meter, gram) the metric system is all based off of 10. If you are going to big to small you would move the decimal to the right and add 0’s if needed.
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Use the following information to calculate the concentration, Ka and pka for an unknown monoprotic weak acid. (8 pts.) 20.00 mL
lisov135 [29]

Answer:

Concentration: 0.185M HX

Ka = 9.836x10⁻⁶

pKa = 5.01

Explanation:

A weak acid, HX, reacts with NaOH as follows:

HX + NaOH → NaX + H2O

<em>Where 1 mole of HX reacts with 1 mole of NaOH</em>

To solve this question we need to find the moles of NaOH at equivalence point (Were moles HX = Moles NaOH).

18.50mL = 0.01850L * (0.20mol / L) = 0.00370 moles NaOH = Moles HX

In 20.0mL = 0.0200L =

0.00370 moles HX / 0.0200L = 0.185M HX

The equilibrium of HX is:

HX(aq) ⇄ H⁺(aq) + X⁻(aq)

And Ka is defined as:

Ka = [H⁺] [X⁻] / [HX]

<em>Where [H⁺] = [X⁻] because comes from the same equilibrium</em>

As pH = 2.87, [H+] = 10^-pH = 1.349x10⁻³M

Replacing:

Ka = [H⁺] [H⁺] / [HX]

Ka = [1.349x10⁻³M]² / [0.185M]

Ka = 9.836x10⁻⁶

pKa = -log Ka

<h3>pKa = 5.01</h3>
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SashulF [63]

Answer: b- it is always a substance

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Hope it helps :)

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