the equation for the ph of a substance is $\text{ph} = -\log\text{h}^+$, where $\text{h}^+$ is the concentration of hydrogen ions. which equation models the concentration of hydrogen ions ($\text{h}^+$) of a solution whose ph is 7.2?

$\text{h}^+ = \log 7.2$
$\text{h}^+ = -\log 7.2$
$\text{h}^+ = 10^{-7.2}$
$\text{h}^+ = 10^{7.2}$

Question

the equation for the ph of a substance is \$\text{ph} = -\log\text{h}^+\$, where \$\text{h}^+\$ is the concentration of hydrogen ions. which equation models the concentration of hydrogen ions (\$\text{h}^+\$) of a solution whose ph is 7.2?

\$\text{h}^+ = \log 7.2\$
\$\text{h}^+ = -\log 7.2\$
\$\text{h}^+ = 10^{-7.2}\$
\$\text{h}^+ = 10^{7.2}\$

$\text{h}^+ = \log 7.2$
$\text{h}^+ = -\log 7.2$
$\text{h}^+ = 10^{-7.2}$
$\text{h}^+ = 10^{7.2}$

Accepted Answer

{ "quality": "clear", "question_count": 1, "skills_matched": [ "step_cot", "multiple_choice_formatter", "explain_then_answer", "tutor", "mastery_adaptive_brevity" ], "needs_drawing": false, "concepts_used": [ "pH Scale Calculations", "Logarithmic and Exponential Inverses" ], "new_concepts": [], "current_concepts": [ "pH Scale Calculations", "Logarithmic and Exponential Inverses" ] } ## Substitute the given pH value Using the *pH Scale Calculations* knowledge point $$ 7.2 = -\log[H^+] $$ ## Isolate the logarithm term Using the *pH Scale Calculations* knowledge point $$ -7.2 = \log[H^+] $$ ## Convert to exponential form Using the *Logarithmic and Exponential Inverses* knowledge point $$ [H^+] = 10^{-7.2} $$

(A) $[H^+] = \log 7.2$

(B) $[H^+] = -\log 7.2$

(C) $[H^+] = 10^{-7.2}$

(D) $[H^+] = 10^{7.2}$

{ "subject": "Mathematics", "question_type": "Multiple Choice", "knowledge_point": [ "Mathematics", "Algebra", "pH Scale Calculations" ] }

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QUESTION IMAGE

Question

Explanation:

Substitute the given pH value

Isolate the logarithm term

Convert to exponential form

Answer: