A certain solution has a hydrogen ion concentration of ×6.5310−5 moles per liter. Write this numbe

To express the hydrogen ion concentration $6.53 \times 10^{-5}$ moles per liter in standard numerical form, we will follow these steps:

1. Understanding Scientific Notation: The expression $6.53 \times 10^{-5}$ signifies that we need to move the decimal point 5 places to the left. This is because of the $-5$ exponent in $10^{-5}$.

2. Calculating the Decimal Placement:

   • Start with $6.53$.
   • Moving the decimal 5 places to the left: $6.53 \rightarrow 0.0000653$

3. Final Form: Therefore, the hydrogen ion concentration in standard form is: $0.0000653 \text{ moles per liter}$

Final Answer

The hydrogen ion concentration is $0.0000653$ moles per liter.