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The question asks to calculate the \([H_3O^+]\) concentration of a solution with a pH of 4.35 and to express the answer in scientific notation to three significant figures.

We can use the formula:

\[
[H_3O^+] = 10^{-\text{pH}}
\]

Given that the pH = 4.35, we substitute this value into the formula:

\[
[H_3O^+] = 10^{-4.35}
\]

Now let's calculate:

\[
[H_3O^+] = 4.47 \times 10^{-5} \, \text{M}
\]

Thus, the hydronium ion concentration is approximately \( 4.47 \times 10^{-5} \, \text{M} \) in scientific notation to three significant figures.

Would you like further details or have any questions?

Here are 5 related questions for further exploration:
1. What is the relationship between pH and \([H_3O^+]\)?
2. How would you calculate the pH if given the \([H_3O^+]\)?
3. What happens to the \([H_3O^+]\) when pH decreases by 1 unit?
4. How does temperature affect the pH of water?
5. Can you explain the difference between pH and pOH?

**Tip:** Always check the number of significant figures required in a calculation involving scientific notation, as rounding can affect the accuracy of your answer.

Calculate the [H3O+] of a solution with a pH of 4.35. Write answer to three significant figures in scientific notation. Use 'E' when writing scientific notation.

Learn how to calculate the [H3O+] concentration of a solution with a pH of 4.35 using logarithmic formulas. This problem demonstrates the use of [H3O+] = 10^(-pH) and provides the answer in scientific notation to three significant figures. Suitable for students in Grades 10-12.

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