he pH of a sample of lake water is measured to be 8.65± 0.05. Note that [H+] = 10-PH elect the answer below that gives the most correct reporting of [H*] with its ncertainty. O 2.23 (0.05) x 10^-9 M © 2.2 (±0.3) x 10^-9 M O 2.23 (±0.26) x 10^-9 M O 2.2 (±0.26) x 10^-9 M O 2.2 (10.1) x 10^-9 M Question O 4 1 pts

Calculate the pH of a 0.15 M solution of a weak base with Kb = 1.8 ×10‒5. Group of answer choices:   2.45 2.51 2.78 11.55 11.49 11.22

A certain weak acid, HAHA, has a Ka�a value of 4.4×10−7.  Calculate the percent ionization of HAHA in a 0.10 M� solution. Express your answer as a percent using two significant figures.

Calculate the hydroxide ion concentration for a solution with [H3O+]eq = 2.8 × 10-5 M. Use "E" for scientific notation. i Respond with the correct number of significant figures in scientific notation (Use E notation and only 1 digit before decimal e.g. 2.5E5 for 2.5 x 105)

10:15 < 1 4 7 Carbonic acid, H₂CO3 is a diprotic acid with Ka1 = 4.3 x 10-7 and Ka2 = 5.6 × 10-¹¹. What is the pH of a 0.18 M solution of carbonic acid? +/- 2 Question 17 of 20 5 8 3 6 9 O Tap here or pull up for additional resources Submit 97 X с x 100

Construct the expression for Ka for the weak acid, HCSH-O4. HC-H-O:(aq) + H2O(I) = H:O*(aq) + C»H;Os (aq) 1 Based on the definition of Ka, drag the tiles to construct the expression for the given acid. Ка RESET [H:O] [H.O*] [OH] [HC-H.O:] [H:C»H÷O.] [CH:O.] 2[H:O] 2[HO*] 2[OH] 2[HCH.O:] 2[H:C»H-O.*] 2[CH-O.] [H:O]? [H.O*j? [OH-P [HC»H-O.JP [H:CH.O.*]? [CH:O.?

Determine the concentration of a NHCl aqueous solution that has a pH = 5.975.  The base ionization constant of ammonia, NH, is: Kb=1.78 × 10-5.  Round off your answer to 3 sig. figs.  Reaction: NH4Cl (aq) → NH4+ (aq) + Cl- (aq)               NH4+ (aq) + H2O (l) ↔ NH3 (g) + H3O+ (aq).

HE154 S20 Ch17 Sec7-9 Later iCloud Preferences... r Practice 17.12- Enhanced - with Feedback • Part A Find the [OH-] of a 0.50 M pyridine (C5 H5N) solution. (The value of K for pyridine (C5 H,N) is 1.7 x 10-9.) Express your answer to two significant figures and include the appropriate units. НА [ОН ]- Value Units %3D Submit Request Answer v Part B Find the pH of a 0.50 M pyridine (C5 H5N) solution.

Calculate the percent ionization of 0.0070 M butanoic acid (Ka = 1.5 × 10-³). Express your answer to two significant figures.

What is the pH of 0.46 M F-  solution? Ka=1.5x10-6. Report your answer to 2 decimals.