Which statement is correct? A. pKa is not an indicator of acid strength. B. An acid with a small Ka is stronger than an acid wit
2 answers:
Answer:
D) An acid with a small pKa is stronger than an acid with a large pKa
Explanation:
Hi, the acity constant (Ka) gives an idea of the strenght of an acid. The higher the Ka, the stronger the acid.
The indicator pKa is obtained by the following formula:
Due to the logarithm, when the Ka increases, the pKa decreases.
<u>Putting all this toghether</u>: An acid with a large Ka has a small pKa and is stronger than an acid with a small Ka (large pKa).
So the correct statement is D
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Answer:
B) 16 g
Explanation:
- 2H₂ + O₂ → 2H₂O
First we <u>convert 4 moles of O₂ into moles of H₂</u>, using the <em>stoichiometric coefficients of the balanced reaction</em>:
- 4 mol O₂ *
= 8 mol H₂
Finally we <u>convert 8 moles of H₂ into grams</u>, using <em>its molar mass</em>:
- 8 mol H₂ * 2 g/mol = 16 g
Thus, the correct answer is option B).