A solution has a pH of 4.75: is the solution, acidic, basic or neutral? what is

Question

A solution has a pH of 4.75: is the solution, acidic, basic or neutral? what is the [H+] ion of the solution? what is the pOH and the [OH-] ion concentration of the solution? And; would the pH increase, decrease or remain the same if some water is added to the buffer? A 0.10 M solution of lactic acid, a weak monoprotic acid of formula HC_3H_5O_3, was found to have a pH 2.43. What is the of Ka for the acid? What is the pH of a 0.20 M aqueous solution of acetic acid, CH_3COOH? Ka for acetic acid = 1.8 times 10-5 What is the pH of a 0.15 M aqueous solution of ammonia? Kb for ammonia is 1.8 times 10-5. Calculate Ka for the anilinium ion given that Kb for aniline (C_6H_5NH_2) is 1.5 times 10_-10 Calculate Kb for the cyanide ion given that Ka for HCN(aq) is 1.5 times 10_-10 What is the pH of a solution that is 0.25 M in formic acid (HCOOH) and 0.15 M in sodium formate? Ka for formic acid is 4.4 times 10-4. Give a recipe for preparing an acetate buffer solution having a pH of 3.60. Ka for acetic acid is 1.8 times 10-5 A saturated solution of silver chromate (Ag_2CrO_4) was found to have a CrO_42 ion concentration of 3.2 times 10-4 M at 25 degree C. What is the K_p for Ag2CrO_4? Calculate the molar solubility of AgCl in 0.100 M sodium chloride given that K_p for silver chloride for 1.6 times 10-10. Calculate the solubility of CaCO_3 (molar mass100.0 g/mol) in mg L in water given K_p is 4.7 times 10-9.

Explanation / Answer

Question 1

pH is the potent of hydrogen

It given by pH = -log [H+]

i) for pH = 4.75

Solution is acidic , as pH scale is defined from 0 to 14 where pH from <7 is acidic , 7 is neutral and pH >7 is basic.

HENCE pH = 4.75 is an acidic solution

ii) pH = 4.75

-log[H+] =4.75

[H+] = antilog (-4.75) = 1.778 * 10-5

iii) pH +pOH =14, SO we have pOH = 14 -pH =14 - 4.75 = 9.25

SO we have -log[OH-] =9.25 . So [OH-] = antilog ( -9.25) = 5.624 * 10-10

iv) for buffer solution , pH does not change for small addition of water , acids , bases . So pH does not change. pH will remain same.

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

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