PAL Practice Exam 3

(Q19) What is the pH of a solution that is 0.768 in hydrosulfuric acid (H2S)? Ka1 = 8.9 x 108 and Ka2 = 1 x 10-19.

(Q17) What is the pH of a solution that is 0.404 M in sodium formate (NaCHO2)? The Ką of formic acid is 1.8 x 104.

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Concentration of Reagents (NH4)2S2O8 KI Na2S2O3 0.25 M 0.22 M 0.19 M Volumes of Solutions S₂082 (mL) Starch soln (mL) KNO3 (mL) EDTA soln (mL) KI (mL) S₂O32- (mL) x 5 9.7 0.9 26.4 0.5 9.9 1.1 Using the above data determine the concentration of I at the moment the reaction begins. HINT: This is a mixing problem. Determine the total number of moles of I and divide this amount by the total volume (in L). Be careful... If you go back and try this exercise again the values will change. Read the question carefully! Answer:

What is the pH and pOH of a solution with [OH-] = 3.0 x 10-11M?  Is this solution acidic or basic? (3.48, 10.52)

(Q17) What is the pH of a solution that is 0.596 M in sodium formate (NaCHO2)? The Ka of formic acid is 1.8 x 10-4.

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Dr. Pepper has an [H+] = 0.000014 M.  What is its pH? (4.85)

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60+ 50 True False 40- kcal/mol 30 20 10 0 course of rx The reaction will proceed spontaneously

Pentanoic acid’s water solubility is 3.7 grams per 100 ml of water. Hexanoic acid’s water solubility is 1.0 grams per 100 ml of water. Explain why pentanoic acid is more soluble than hexanoic acid. Ccan you help me, please? Can you explain to me, please?

(Q59) What is the molality of a solution that contains 73.7 grams of strontium fluoride that has been added to and dissolves in 3.13 liters of water? The density of water is 1.00 kg/L. (3 sf)

Part 1 Walk nodi bas maldorq gniwollot oil bas od steluola) (c) obinoldo (11)non g 42 anino nohtulos 200oups Jm-0.28nA Solution 1 2 3 4 Data related to aqueous solutions of sodium chloride (NaCl) and aqueous solutions of ethanol (C₂H5OH) are provided in the table below. Use the table to answer the following questions. Circle the letter of the choice that best answers the question. NaCl 3.0 3.0 3.0 3.0 Mass (g) H₂O 100.0 200.0 300.0 400.0 Solution 5 6 7 8 Totuloa sili to 22m orb ei 18W 2 Toobtulos sit to omulov o zi indWa 3. What is the percent by volume of C₂H5OH in Solution 5? a. 0.2% b. 1.9% c. 2.0% Volume (mL) C₂H5OH 2.0 5.0 9.0 15.0 H₂O 100.0 100.0 100.0 100.0 d. 22%

What is the pH of a solution of a 0.045 M of a strong acid? (1.35)

11:17 Worksheet 3 Question 2 of 10 nieaf tis Cnty 2. [Short answer] What is the IUPACname for the compound shown below? Short Answer Type Answer Here 140 Next Question Previous Question

1) Which of the diet sodas have the highest concentration of caffeine? Which standard best reflects this concentration?

Find the GCF of the given list. 3. 2 - 18x°y², 6x²y, 36xy 4,4 The GCF is (Simplify your answer.)

Calculate the Kb of a 0.71 M solution of X that has a p O H of 1.8. Answer to three significant figures.   Answer:     (0.000362)

1. Colgate toothpaste contains 0.245 w/w% NaF as a source of fluoride ion (F') a) How many grams of NaF are in 1.0 g of toothpaste? (2.4 x 103 g) b) How many grams of F are in 1.0 g of toothpaste? (1.1 x 10° g) 2. If you dissolve 2.2 g of the same Colgate toothpaste in 100 mL water, a) What is the molarity of NaF in this solution? (1.3 x 10³ M) b) What is the molarity of fluoride ion in this solution? (1.3 x 10° M) c) What is the concentration of NaF in this solution, in ppm? (54 ppm) d) What is the concentration of fluoride ion in this solution, in ppm? (24 ppm)

kb = 1.8 x 10-5 What is pkb, pka, and ka when kb is given

ipboard Font Paragraph Styles Aspirin Yield Lab NAME: 6. How much aspirin is needed for Part B #1? PRE-LAB 1. What is an antipyretic? REPORT: 2. What is an analgesic? A. Preparation of Aspirin DAY 1 3. What is the "active ingredient" in aspirin? Why is it not ingested directly? 1. Mass of salicylic acid (g) 2. Mass of filter paper (g) 4. In this experiment, 2.00 g of salicylic acid reacts with an excess amount of acetic anhydride. Calculate the theoretical yield of acetylsalicylic acid for this synthesis. 3. Mass of dried filter paper plus sample (g) 4. Theoretical yield of aspirin (g) 5. Experimental (actual) yield of aspirin (g) 5. A0.331 g sample of aspirin prepared in the laboratory was dissolved in 95% ethanol and titrated to a phenolphthalein endpoint with 16.7 ml of 0.107 M NAOH. 7. Volume of water used in the experiment 8. Mass of aspirin dissolved in the experiment (see A7 a. Calculate the moles of acetylsalicylic acid in the aspirin sample. 6. Experimental yield, corrected…

Write the chemical equation

d) (2 pts) BHCI CH3 + H₂C 1. Mix 2. NaOH, H₂O₂ D

Aspartic acid is a polyprotic system whose forms can be written as H3A+, H2A, HA-, and A2-. Its Ka values are: Ka1 = 1.02 x 10-2 Ka2 = 1.26 x 10-4 Ka3 = 9.95 x 10-11 How many milliliters of 0.30 M NaOH should be added to 100 mL of a solution containing 8.0 g of the neutral, zwitterionic form of aspartic acid (M.W. = 133.10 g/mol) to bring the pH to 10.3? Find the  answer to the nearest mL. The answer is between 300 and 400. Retain 4 d.p. in your calculations and don't round until you calculate the volume of NaOH required at the very end.