plz solve the following 4 questions: first box options for Q.8: No, it doesn\'t

Question

plz solve the following 4 questions:

first box options for Q.8: No, it doesn't matter, Yes

Question 5 2 pts To increase the acidity of soil, you can add peat, which contains a complex acid mixture known as humic acid, a diprotic acid (two acidic protons. The complexity of the humic acid makes it difficult to determine how acidic you are making the soil. You decide to use a titration to get a better measure. If a titration of an unknown sample of humic acid required 5.03 mmols of NaOH, how many mmols of humic acid were present in the unknown sample? Question 6 4 pts To increase the acidity of soil, you can add peat, which contains a complex acid mixture known as humic acid, a diprotic acid (two acidic protons. The complexity of the humic acid makes it difficult to determine how acidic you are making the soil. You decide to use a titration to get a better measure. If titration of a 46.2 mL extraction from the peat requires 5.78 mL of 1.00 mM sodium hydroxide, what is the concentration (in mM)of humic acid in the peat? Question 7 1 pts How many significant figures should be reported in your answer above?

Explanation / Answer

Question 5)

Since humic acid is di-protic acid

Hence number of moles of humic acid = number of moles of NaOH/2 = 5.03 m mols/2 = 2.515 mmols of humic acid

Question 6)

Let the molarity of humic acid be M

46.2/1000 * M * 2 = 5.78/1000 * 1.00 mM

92.4M = 5.78mM

M = 6.255 * 10^(-5) M

Question 7)

Since each and every data is reported to three significaint figures, hence the molarity of humic acid will also be reported till three signifiicant figures

Correct answer is 3

Question 8)

Correct answer is Option B (Safe for environmental use)

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