103 8. Use the same ideas that were used to decide incompatibility in Question 3

Question

103 8. Use the same ideas that were used to decide incompatibility in Question 3c of Review 1 and your experimental observations in Experiment 3 to place each of the following acid-base pafrs in the table below so that the acid strength decreases going down the table. Make your decision on the bast1s of the extent of an appropriate acid/base reaction. In each case place the number on the hlank line in the acid column to represent the position of the pair in the two columns; then explain your decisions. Mg ( H20)4(OH)2 / Mg(H20 )3(OH )3- ACH20)63CH0(0H 1) 2) ase NHA Justify the placement of each pair based an your observations of specific reactions of these ions. 2)

Explanation / Answer

Outline: pKa = -Log Ka

As the pKa value decreases, Ka value increases then the acid strength increases.

pKa values: H3O+ = -1.74, NH4+ = 9.26and H2O = 15.74

The increasing order of pKa values: H3O+ < NH4+ < H2O

The decreasing order of acid strength: H3O+ > NH4+ > H2O

Related Questions

Navigate

• Browse (All)
• Browse 1
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.