ooth enamel is composed of hydroxyapatite, CasPO OH, but toothpaste ads warn aga

Question

ooth enamel is composed of hydroxyapatite, CasPO OH, but toothpaste ads warn against "acid erosion" x 10mol/L, what is its solubility in acid Cbuffered at plH 3y ue to acidie foods and beverages. If the solubility of Cas(PO) OH in water (buffered at ph is a) 1.7 x 10-12mol/ b) 2.3 x 10mol/L c) 4.7x 1o mo/L d) 1.7 x 10 mol/L e) 8.2 x 10 mol/L 9) Hydrofluoric acid is a solution of hydrogen fluoride (HF) in water. It is a precursor to almost all compounds, including pharmaceuticals such as fluoxetine (Prozac), diverse materials such as PTFE (Teflon), toward many ith the and elemental fluorine itself. Because of its high reactivity toward glass and moderate reactivity metals, hydrofluoric acid is usually stored in plastic. Aqueous hydrofluoric acid is a contact-poison w potential for deep, initially painless burns and ensuing tissue death. If HE has a pka value of 3.17, what is th percent dissociation of0.15M HF(aq)? a) 0.29% b) 6.5% c) 16% d) 34% e) 65%

Explanation / Answer

8)

Answer

e) 8.2 ×10^-1mol/L

9)

Answer

b) 6.5%

Explanation

HF <-----> H+ + F-

Ka = [H+] [F-]/[HF] = 6.76×10^-4

Related Questions

Navigate

• Browse (All)
• Browse O
• Subjects

---

---

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