Question

question 13
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calculate $\text{h}_3\text{o}^+$ for a solution of ph 4.3.
respond with the correct number of significant figures in scientific notation (use e notation and only 1 digit before decimal e.g. 2.5e5 for $2.5 \times 10^5$)
type your numeric answer and submit.
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question 14
mark as: none
calculate $\text{h}_3\text{o}^+$ for a solution of ph 5.3.
respond with the correct number of significant figures in scientific notation (use e notation and only 1 digit before decimal e.g. 2.5e5 for $2.5 \times 10^5$)
type your numeric answer and submit.

Explanation:

Step1: Recall pH to [H₃O⁺] formula

The relationship is $[\text{H}_3\text{O}^+] = 10^{-\text{pH}}$

Step2: Calculate for pH 4.3

Substitute pH = 4.3: $[\text{H}_3\text{O}^+] = 10^{-4.3} = 5.01187 \times 10^{-5}$
Round to 1 significant figure (matches pH decimal places) and convert to E notation: $5\text{E-5}$

Step3: Calculate for pH 5.3

Substitute pH = 5.3: $[\text{H}_3\text{O}^+] = 10^{-5.3} = 5.01187 \times 10^{-6}$
Round to 1 significant figure and convert to E notation: $5\text{E-6}$

Answer:

For Question 13: $5\text{E-5}$
For Question 14: $5\text{E-6}$