Question 8.SP.5: Calculating pH Using the [H3O^+]Determine the pH for the fol......
Calculating pH Using the [H_{3}O^{+}]
Determine the pH for the following solutions :
a. [H_{3}O^{+}]=1.0 ×10^{-5} M b. [H_{3}O^{+}]=5×10^{-8} M
Step-by-Step
a. Step 1 Enter the [H_{3}O^{+}].
pH=-log[1.0 ×10^{-5}]=1.0 \boxed{EE or EXP} 5 \boxed{+/-} \overset{Calculator Display}{1.0^{-05} or 1.0 E-05}
Step 2 Press the log key and change the sign.
\boxed{log} \boxed{+/- } 5
Step 3 Adjust the number of SFs on the right of the decimal point to equal the SFs in the coefficient.
\begin{matrix} 1.0 &\times 10^{-5}&M &pH=5.00 \\Two SFs&\longrightarrow &&Two SFs on the right of the decimal point \end{matrix}
b. Step 1 Enter the [H_{3}O^{+}]
.
pH=-log[5\times 10^{-8}] =5 \boxed{EE or EXP} 8 \boxed{+/- } \overset{Calculator Display}{5^{-08} or 5 E-08 }Step 2 Press the log key and change the sign
\boxed{log} \boxed{+/- } 7.301029
Step 3 Adjust the number of SFs on the right of the decimal point to equal the SFs in the coefficient.
\begin{matrix} 5 &\times 10^{-8}&M &pH=7.3 \\One SFs&\longrightarrow &&One SFs on the right of the decimal point \end{matrix}
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