Question

The pH of a solution is calculated using the equation pH = −logH+, where H+ is the concentration of hydrogen ions. If the pH of a solution is 4, what is the concentration of hydrogen ions?−410,0000.250.0001

Answer 1

From the question, we have been given the equation for pH and we want to calculate the concentration of hydrogen given as H​+

This becomes

`\begin{gathered} pH=−logH^+ \\ \end{gathered}`

We were given the pH as 4. Substituting this into the equation, we have

`\begin{gathered} 4=-logH^+ \\ -logH^+=4 \\ logH^+=-4 \\ taking\text{ antilog, we have } \\ antilog(logH^+)=antilog-\text{ 4} \\ H^+=0.0001 \end{gathered}`

Hence the answer is 0.0001 the last option