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Nataly [62]
2 years ago
12

1 What is the pH of a substance that has a hydrogen ion concentration of 1.2 x10-2 M2 ZpG

Chemistry
2 answers:
Jobisdone [24]2 years ago
5 0

Answer:

Approximately 1.92.

Explanation:

The {\rm pH} of a solution is the opposite of the base-10 logarithm of that solution's {\rm H^{+}} concentration measured in {\rm mol \cdot L^{-1}}. In other words:

{\rm pH} = - \log_{10} ([{\rm H^{+}]).

Using properties of logarithms:

\begin{aligned}{\rm pH} &= - \log_{10} ([{\rm H^{+}]) \\ &= -\left(\frac{\ln([{\rm H^{+}]})}{\ln(10)}\right)\end{aligned}.

In this question, [{\rm H^{+}}] = 1.2 \times 10^{-2}\; {\rm mol \cdot L^{-1}}. Therefore:

\begin{aligned}{\rm pH} &= - \log_{10} ([{\rm H^{+}]) \\ &= -\left(\frac{\ln([{\rm H^{+}]})}{\ln(10)}\right) \\ &= - \frac{\ln(1.2 \times 10^{-2})}{\ln(10)} \\ &\approx 1.92\end{aligned}.

By convention, the number of decimal values in the {\rm pH} should be equal to the number of significant figures in the {\rm H^{+}} concentration of the solution.

In this question, there are two significant figures in the measurement[{\rm H^{+}}] = 1.2 \times 10^{-2}\; {\rm mol \cdot L^{-1}}. Thus, the {\rm pH} result should be rounded to two decimal places.

Andrej [43]2 years ago
4 0

Answer:

The pH o.s the s.u.b.st.a.n.c.e is 1,92.

Explanation:

pH = -log (H +)= -l.o.g (1.2 x 10^-2 )=1,92

hope this helps

plz mark brainliest  

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