A 1.0-L buffer solution contains 0.100 mol acid, HA, and 0.100 mol base, NaA. The value of K, for the acid HA is 1.8x104. Ignoring the small volume change, what is the most likely pH of the solution if a 10.0 mL- sample of 1.00 M HCI is added to the original buffer? O 5.50 < pH < 5.74 O 3.51 < pH < 3.69 O 4.10 < pH < 4.22 O 1.20 < pH < 1.45

Calculate the pH of a buffer solution containing 0.584 mol HA weak acid and 0.703 mol A- in 130.1 mL  after 0.158 g of NaOH was added? [Ka= 1.56 ×10-5] Report your answer with three decimals. Enter numbers only; do not enter units.

1613 The pH of a bicarbonate-carbonic acid buffer is 8.00. Calculate the ratio of the concentration of car- bonic acid (H,CO3) to that of the bicarbonate ion (HCO5). 0 10 AA No H PO./

We have 500.0 mL of a buffer solution that is 0.697 M in NH3 and 0.380 M in NH4Cl. We add 500.0 mL of a solution 0.202 M in HCl. The final volume is 1.0000 L. The Kb value for NH3 is 1.8 x 10-5. What is the pH of the final solution?

Q2: Calculate the pH of the following acid-base buffers. 100 mL of 0.025 M formic acid and 0.015 M sodium format [a]after adding 5.0 x 10 mole of HCl.[b] after adding 5.0 x 10 mol of NaOH. [K, = 1.77x 10 1 %3D

A buffer solution contains 0.268 M ammonium chloride and 0.311 M ammonia. If 0.0169 moles of hydroiodic acid are added to 125 mL of this buffer, what is the pH of the resulting solution ? (Assume that the volume does not change upon adding hydroiodic acid) pH =

A 1.37 L buffer solution consists of 0.298 M propanoic acid and 0.175 M sodium propanoate. Calculate the pH of the solution following the addition of 0.067 mol HCI. Assume that any contribution of the HCl to the volume of the solution is negligible. The K, of propanoic acid is 1.34 × 10-5. pH =

At 22 ∘C,an excess amount of a generic metal hydroxide, M(OH)2, is mixed with pure water. The resulting equilibrium solution has a pH of 10.22. What is the ?sp of the salt at 22 ∘C?

Dino needs to prepare 200.0 mLs of a 0.25M /0.20 M buffer solution that has pH of 4.7. To make this buffer solution, Dino has available 0.50 M solutions each of the following: Chemicals .. NH3/NH4CI •HCOOH/HCOOK HONH2/HONH3CI CH3COOH/NaCH3COO ● NH3/NH4CI HONH2/HONH3C HCOOH/HCOOK K₂ Which set of conjugate acid - base pairings should Dino select? CH3COOH/NaCH3COO 1.78 x 10-5 5.62 x 10-10 1.82 x 10-4 9.12 x 10-9

A chemistry graduate student is given 300. ml. of a 1.40M chlorous acid (HCIO₂) solution. Chlorous acid is a weak acid with K-1.1 x 10 What mass of NaCIO, should the student dissolve in the HCIO, solution to turn it into a buffer with pH -1.947 You may assume that the volume of the solution doesn't change when the NaCIO, is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 significant digits. X