Which of the following procedures will create a buffered solution? ii. i. Equal volumes of 0.5 M NaOH and 1 M HCI are mixed Equal volumes of 0.5 M NaOH and 1 M HC₂H3O2 are mixed. Equal volumes of 1 M NaC2H3O2 and 1 M HC₂H3O2 are mixed iii. a. I only b. lll only c. II and III only d. II only

Which of the following can be classified as buffer solutions?a. 0.25 M HBr + 0.25 M HOBrb. 0.15 M HClO4 + 0.20 M RbOHc. 0.50 M HOCl + 0.35 M KOCld. 0.70 M KOH + 0.70 M HONH2e. 0.85 M H2NNH2 + 0.60 M H2NNH3NO3

Which of the following  constitute a buffer? A. NH3 and KNO3 B. HCN & NaCN C. HF & NaCl D. NaOH & NaCl Group of answer choices C A & C B A, B and C

The primary purpose of a buffer is to   Select one: a. Maintain the hydrogen ion concentration of a solution b. Alter the sodium concentration of a solution c. Alter the hydrogen ion concentration of a solution d. Maintain the sodium concentration of a solution

What is the pH of a buffer made by combining 45 ml of 0.15M nitrous acid and 20 ml of 0.175 M sodium nitrite a. 3.43 b. 3.64 c. 3.28 d. 3.06

Which of the following would be most effective as a buffer? A. pure water   B. a mixture of molecules that are bonded to each other with hydrogen bonds   C. a mixture of unbonded atoms   D. a mixture of molecules with ionic bonds that will break apart into ions   E. a mixture of nonpolar molecules

A solution is prepared by mixing 10mL of 1 M HCI and 10mL of 1.2 M NaOH. What is the approximate pH of the solution? a. 0 b. 1 C. 7 d. 13

Identify the two “active species” in each of the following buffer systems. a. HF and LiF b. Na2HPO4 and KH2PO4 c. K2CO3 and KHCO3 d. NaNO2 and HNO2

eade 6. In pure water, the concentrations of H₂O* and OH are equal. In an ACIDIC solution, the [H₂O*] is higher/lower (circle one) compared to [OH-], while in BASIC solution the [H3O*] is higher / lower (circle one) compared to [OH']. B. Finding the pH of Commonly Encountered Household Substances 1. Table 3. Indicator color, pH, and whether that shows the substance is an acid, base, or neutral. Acid, base, or neutral? acidic Substance Distilled water Baking soda Vinegar Lemon juice Window cleaner Seltzer water Antacid tablets Aspirin tablets Indicator color light purple turqouise Fuschia light pink green Blue light blue red pink Estimated pH 5 10 3 4 11 7 7 8 2 base acidic acidic Base neutral Base acid 2. Of all the items tested, which is the most acidic? Using the pH you determined, what is the approximate [H3O+]? 3. Of all the items tested, which is the most basic? Using the pH you determined, what is the approximate [H3O*]?

During a titration, it is found that 59.5 mL of a solution of NaOH is needed to neutralize a solution that contains 1.69 g HCL. What is the concentration of the NaOH solution?  a.) 0.3535m b.) 0. 6869m c.) 0. 7790m d.) 0. 6051m e.) 1.055m