11. (15 pointy) CrOH),() as a Kp of 3.0x 102 A. Write a reaction representing th

Question

11. (15 pointy) CrOH),() as a Kp of 3.0x 102 A. Write a reaction representing the dissolution of Cr(OH)3 (s). B. Write the Ksp equilibrium constant expression. C. Will a saturated aqueous solution of Cr(OH)3 (s) be acidic, neutral, or basic? D. Calculate [Cr "1 in a saturated aqueous solution of Cr(OH)3 (s) prepared in pure water E. Calculate (Cr in a saturated aqueous solution of Cr(OH)3 (s) prepared in a solution buffered to pH-8.00. You may assume that the buffer maintains this pH even after dissolution of small amounts of the solid. Hint: this is a common ion effect situation -the buffer fixes the hydroxide concentration at the value corresponding to pH solving for [Cr . 8.60, and you should use this [OH' ] in the Ksp expression

Explanation / Answer

a) the dissolution goes as follows

Cr (OH)3 <------> Cr+3 + 3 OH-

b) kps = s * 3s3, let s be the solubility at a saturated solution

kps = 27 s4

c) from part A we can see that there are OH ions, so the solution will be basic

d) apply the equation

3 x10-29 = 27 s4

s4 = 1.1 x10-30

s = 3.24 x 10-8 M

Related Questions

Navigate

• Browse (All)
• Browse 1
• Subjects

---

---

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