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- Activity 2. Self-ionization of water and pH, pOH, pKw »1. Write the law of mass action for the reaction of self-ionization of water and calculate the concentrations of [H;O*] and [OH]. H,0(1) + H20(1)= H30*(aq) + OH-(aq) Kw = 1.0x10-14 %3D 2 Since working with yery small powers of 10 can be inconvenient, we commonly use the mathematical7-43. Supply the missing data in the table below. Molar Analytical Concentration, c- (ct = Cha + cx-) pH (A"] Acid (HA] Hypochlorous 0.280 7.00 Nitrous 0.105 0.413 0.587 0.145 0.221 Hydrogen cyanide Sulfamic 0.250 1.20Important equations Attach additional paper, if necessary, to show complete work Indicate which problems you have worked out on a separate sheet of paper [HJOH)=K1.00 x 10" (at 25 "C) pH=- log (H) pOH- log (OH) pH+ pOH- 14.00 Moroo K- IHAJ ort 1. Determine the phi of 0.055 M oxalic acid (HCO, K. -5.6x 10' and K-54x 10). Note: both steps are important here, therefore we have to set up two "ICE boxes 2. Nicotine, CHN, is a base that will accept two protons (K,7x 10, K 14x 10"). What is the pH and the concentration of each species present in a 0.010 M solution of nicotine?
- 4. The pH of 1.50 mol/L acid is measured to be 5.75. For this acid, the Ka is 10-5.25 = [H₂₂0] A. 2.1 x 10-¹2 B. 1.8 x 10-6 C. 2.4 x 10-6 D. very large Chatz (H30] = 1.77x10-6 = 1,8x10-6 In the following information to answer the next question.What is Kb for the equilibrium rreacton: CN- + H2O <=> HCN + OH- ? Ka value of 6.23 x10-10What is the expecteconcentration of OH in a saturated calcium hydroxide solution? Ksp of calcium hydroxide = 5.5x10-6. Select one: O a. 1.1 x 10-2 M O b. 2.8 x 10-2 M O c. 4.6 x 10-³ M O d. 2.3 x 10-3 M O e. 2.2 x 10-2 M
- The expression for K and K, for the reaction PH,BCI,(s) - PH,(g) + BCI,(g) K = [PH,J[BCI,1/[PH3BCI3] and K, = P(PH,)'p(BCI,) Select one: True False1.10 M Acetic acid 0.900 M Sodium acetate [H30*1 (M) Solution (mL) |(mL) 1 8.00 2.00 8.71e-5M 2 7.00 3.00 5.13e-5M 6.00 4.00 3.24e-5M 4 5.00 5.00 2.17e-5 5 4.00 6.00 1.45e-5M 6. 3.00 7.00 9.31e-6M 7 2.00 8.00 1.00 9.00 00V (acetic and CH ₂ COOH) = 10ml C = 0,271 M titrated with potassium hydroxide solution c= 0, 253 M a) pH=? (V (KOH) = 0,00, 3,00, 6,00, 9,00, 12,00 ml) 6) [H₂0], [OH-] = ? (in the solutions) pka (CH₂COOH) = 4, 15
- 0-25 Nor 1lit of Hcl mixed Ceith OINO somlor Hel, then find Normalibs q folition is A) 0. 16 B) 0.24 C) 0. 32 )) 0.48Saved CHEMY 101 SEC SEM T2 2020-21 The amount of water which should be added to 0.700 M NAOH solution to make 100 mL 0.250 M solution is 19 Multiple Choice 01:25:58 79.6 mL 35.7 mL 55.2 mL 64.3 mL raw K Prev 19 of 20 Next >Formulate a hypothesis regarding the solubility of aspirin at different pH.The experimentA) Three teaspoons of water (approx. 15 ml) were added to one tablet said to contain 300 mg of aspirin. Fizzingwas observed. Most of the tablet dissolved, but there were some solid particles. By heating the mug in amicrowave for 10 second increments until the water came to the boil (approx. 3x), all of the solid particlesdissolved. The solution was left to cool to room temperature and then placed in a fridge and NOTHINGHAPPENED. Try this yourself if you can spare two aspirin tablets, your results might look different.• Questions to ask:1. What might the fizzing bubbles be?2. Can you give a chemical explanation?3. Can you write a chemical reaction equation with aspirin reacting with something to give a gas and aspirinin another form?4. What might be the formulation (what the manufacturer mixes with aspirin in making the tablet) “trick”for aspirin to improve solubility?5. How does this compare with…