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ziro4ka [17]
2 years ago
7

A chemist is using a solution of HNO3 that has a pH of 3. 75. What is [H ] for the solution? Round to the nearest hundredth. × 1

0n M n =.
Chemistry
1 answer:
Alexeev081 [22]2 years ago
8 0

The estimation of the acidic and the basic character of a solution is called and defined by the pH. The \rm [H^{+}] concentration of the solution will be \rm 1.77\times 10^{-4}.

<h3>What is the pH?</h3>

pH is a measurement of the free hydrogen and hydroxyl ions in the solution of the substance.

It can be calculated as:

\rm pH  = - \rm log[H^{+}]

Given,

pH = 3.75

Substituting values in the equation:

\begin{aligned}\rm 3.75 &= -\rm log[H^{+}]\\\\\rm [H^{+}] &= 10^{-3.75}\\\\&= 1.7782 \times 10^{-4}\end{aligned}

Therefore,  \rm 1.77\times 10^{-4} is the concentration of the hydrogen ions.

Learn more about pH here:

brainly.com/question/10285267

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CH4 + O2 -> CO2 + H2O, which is rather exothermic. To find the heat released by burning a certain amount of the substance, you should look at the bond enthalpy of each compound, and then compare the values before and after the reaction. In methane, there are 4 C-H bonds, which have bond energy of 416 kj/mol, resulting in a total bond energy of 1664 kj/mol. O2 is 494 kj/mol. Therefore we have a total of 2080 kj/mol on the left side. On the right side we have CO2, which has 2 C=O bonds, each at 799 kj/mol each, resulting in 1598 kj/mol, and H2O has 2 O-H bonds, at 459kj/mol each, resulting in a total of 2516 kj/mol on the right hand side. Now, this may be confusing because the left hand side seems to have less heat than the right, but you just need to remember: making minus breaking, which results in a total change of 436kj/mol heat evolved.

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7 0
3 years ago
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