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Artyom0805 [142]
11 months ago
13

Calculate the pH of milk with a hydrogen ionconcentration of 4.25 x 10^-7 mol dm-3. Show all steps ofyour calculations and inclu

de the correct units
Chemistry
1 answer:
yulyashka [42]11 months ago
5 0

Answer:

6.37.

Explanation:

What is given?

[H (+)] = 4.25 x 10⁻⁷ mol/dm³

Step-by-step solution:

First, let's see the formula to calculate the pH based on the hydrogen ion concentration (H (+)):

pH=-log\lbrack H^+].

*Logarithm must be in base 10!

Our given concentration of hydrogen ion is 4.25 x 10⁻⁷ mol/dm³. Remember that the units of concentration must be in M (mol/L) but in this case, 1 dm³ equals 1 L, so based on this, we have that:

4.25\cdot10^{-7}\frac{mol}{dm^3}=4.25\cdot10^{-7}\frac{mol}{L}.

So, we can replace this value in the formula of pH:

pH=-log\lbrack4.25\cdot10^{-7}]\approx6.37.

The pH of milk would be 6.37 which means that is slightly acid (weak acid).

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Answer:

Dispersion forces.

Explanation:

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3 years ago
How many liters of oxygen are required to react completely with 14.8 mol of Al?
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Answer:

296 L  

Explanation:

We will need a balanced equation with moles, so let's gather all the information in one place.

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n/mol:        17.4

1. Moles of O₂

n = \text{17.4 mol Al}\times \dfrac{\text{3 mol O}_{2}}{\text{4 mol Al}}= \text{13.05 mol O}_{2}

2. Volume of O₂

You haven't given the conditions at which the volume is measured, so I assume it is at STP (0 °C and 1 bar).

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Most modern medications are given in doses of milligrams. Thyroid medications, however, are typically given in doses of microgra
leonid [27]

Answer:

0.125 mg

Explanation:

<em>The correct answer would be 0.125 mg</em>

<u>According to the conversion factor, one milligram of a sample is equivalent to one thousand micrograms of the same sample.</u>

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microgram = 10^{-6}

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Explanation:

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Answer:

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It occurs as a crystal with red- violet type colour.

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