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Artyom0805 [142]
3 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]3 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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2 years ago
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Isopropyl alcohol is mixed with water to produce a 35.0 % (v/v) alcohol solution. How many milliliters of each component are pre
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229.25 mL of isopropyl alcohol

425.75 mL of water

Explanation:

Knowing that the solution have a 35.0 % (v/v) isopropyl alcohol in water, we can calculate the volume of each component as following.

volume of  isopropyl alcohol = (35/100) × solution volume

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Now, knowing the volume of isopropyl alcohol we can determine the volume of water.

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2 years ago
Explain why Thorium-229 is radioactive
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Calculate the enthalpy change for the thermite reaction: 2al(s)+fe2o3(s)→2fe(s)+al2o3(s), δh∘rxn=−850 kj when 4.00 mol of al und
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<u>Given:</u>

Enthalpy change ΔH for the thermite reaction = -850 kJ

Moles of Al involved = 4

<u>To determine:</u>

Reaction enthalpy when 4 moles of Al reacts

<u>Explanation:</u>

The thermite reaction is-

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6 0
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