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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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<u>The balanced chemical equation for the combustion of heptane</u>:

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<u>To calculate the standard enthalpy of reaction (\Delta H _{r}^{\circ }) can be calculated by the Hess's law</u>:

\Delta H _{r}^{\circ } = \left [\sum \nu \cdot\Delta H _{f}^{\circ }(products)  \right ] - \left [\sum \nu\cdot\Delta H _{f}^{\circ }(reactants)  \right ]

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\left [ 7\times \Delta H _{f}^{\circ }\left (CO_{2}\right )+ 8\times \Delta H _{f}^{\circ }\left (H_{2}O \right )\right ]

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We use the ideal gas equation: P.V = n.R.T

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