ask 11.12 thanks 2每張試題春務必填寫(學號)、 (姓名)。The etnyl acetate concentration in an alcoholic solution was determined by diluting a 10.00 ml. sample to 100.00 ml. A20.00 ml portion of the dilution was was refluxed with 40.00 mL of 0,04672 M KOH:CHCOOCHs+OH CHCOO+CH,OHAfter cooling, the excess OH was back-titrated with 3.41 ml of 0.05042 M H,SO.Calculate the number of grams of ethylacetate (FM 88.11 g/mol) per 100 ml. of the original sample11. The amount of Na:S:Os consumed in the back-titration is (a) 0.3439 mmole (b) 0.2625 mmole (c) 0.1874 mmole (d)0.0928 mmole12. The number of grams of ethyl acetate is (a) 0.4305 g (b) 0.5655 g (c) 0.6718 g (d) 0.7288 g

Question 11 is not related with the given problem.

2每張試題卷得必填寫(學號)、(姓名) The ethyl acetate concentration in an alcoholic solution was determined by diluting a 10.00 ml sample 20.00 ml portion of the dilution was was refluxed with 40.00 mL. of 0,04672 M KOH: CHCOOCH, + OH CH;COO + CHOH [+] After cooling, the excess OH was back-titrated with 3,4I ml, of 0.05042 M H;SO.Calculate the number of grams of eth acetate (FM 88.11 g/mol) per 100 ml. of the original sample 11. The amount of Na:S;O) consumed in the back-titration is (a) 0.3439 mmole (b) 0.2625 mmole (c) 0.1874 mmole (c 0.0928 mmole 12. The number of grams of ethyl acetate is (a) 0.4305 g (b) 0.5655 g (c) 0.6718 g (d) 0.7288 g

2每張試題卷得必填寫(學號)、(姓名) The ethyl acetate concentration in an alcoholic solution was determined by diluting a 10.00 ml sample 20.00 ml portion of the dilution was was refluxed with 40.00 mL. of 0,04672 M KOH: CHCOOCH, + OH CH;COO + CHOH [+] After cooling, the excess OH was back-titrated with 3,4I ml, of 0.05042 M H;SO.Calculate the number of grams of eth acetate (FM 88.11 g/mol) per 100 ml. of the original sample 11. The amount of Na:S;O) consumed in the back-titration is (a) 0.3439 mmole (b) 0.2625 mmole (c) 0.1874 mmole (c 0.0928 mmole 12. The number of grams of ethyl acetate is (a) 0.4305 g (b) 0.5655 g (c) 0.6718 g (d) 0.7288 g

Introductory Chemistry For Today

8th Edition

ISBN:9781285644561

Author:Seager

Publisher:Seager

Chapter7: Solutions And Colloids

Section: Chapter Questions

Problem 7.107E

See similar textbooks

Similar questions

A solution is made by dissolving 0.455 g of PbBr2 in 100 g of H2O at 50C. Based on the data in Table 8-1, should this solution be characterized as a. saturated or unsaturated b. dilute or concentrated
A solution is made by dissolving 34.0 g of NaCl in 100 g of H2O at 0C. Based on the data in Table 8-1, should this solution be characterized as a. saturated or unsaturated b. dilute or concentrated
To analyze an aspirin sample, 0.3470 g of crushed tablets are weighed and treated with 50.00 mL 0.1155 M sodium hydroxide, boiling for 10 minutes. Under these conditions the acid acetylsalicylic (MW, 180) reacts according to: CH3COO-C6H4-COOH + 2 OH- → OH-C6H4-COO- + CH3COO- The excess NaOH is then titrated with 11.5 mL of 0.2100 M HCl. What is the purity of said show ?.
Solution X 100 mL of 0.10 M NaOH(aq) is mixed with 100 mL of 0.10 M HBr(aq) Solution Y 100 mL of 0.10 M NaBr(aq) is mixed with 100 mL of 0.10 M HBr(aq) Solution Z 100 mL of 0.10 M HC,H,O,(aq) is mixed with 100 mL of 0.10 M NaC,H3O,(aq) 6. A student prepares three solutions, X, Y, and Z, as described in the table above. The values of Ka for the acidic species in the solutions are given in the table below. Species Ka HBr(aq) >>I (very large) HC,H;O,(aq) 1.8 x 10-5 a. Using the information above, write the letters of the solutions in the boxes below to rank the solutions in order of increasing pH. Explain your reasoning for the ranking Lowest pH Highest pH b. Does the pH of solution Y increase, decrease, or remain the same when 100 mL of water is added? Justify your answer. c. The student adds 0.0010 mol of NaOH(s) to solution Y, and adds 0.0010 mol of NaOH(s) to solution Z. Assume that the volume of each solution does not change when the NaOH(s) is added. The pH of solution Y changes…
O e) % KBr = % 66.2 , % KCI = % 33.8 %3D The solubility product (Ksp) for 4 points Pb(OH)2 (s) is 2.5 x 10-16. What would be the quantity of solubility by g/L of Pb(OH)2 which has Mwt =241.2 g/mole)? O 9.947 x 10-4 O 5.975 x 10-4 O 7.596 x 10-5 O 9.575 x 10-4 O 9.723 x 10-4 Calculate [H+], PH and POH 4 points
The ethyl acetate concentration in an alcoholic solution was determined by diluting a 10.00-mL sample to 100.00 mL. A 19.00-mL portion of the diluted solution was refluxed with 40.00 mL of 0.04601 M KOH: CH3 СОО С2H; + ОН — СH3 COO + C2H; ОН After cooling, the excess OH was back-titrated with 3.02 mL of 0.05056 M H2 SO4. Calculate the amount of ethyl acetate (88.11 g/mol) in the original sample in grams. Amount of ethyl acetate =
Toxie chromate can be removed from solution uning the following reaction 2 Cro, lag) + 3SO4H'(ag)- Cry(SOls) + 2HyOA 5o, Is bubbled through 3.0x 10Lofa solution. All of the chromate is removed and 2.94 x 10 kg of the precipitate is formed. Calculate the initial concentration (in units of mM) of chromate in solution. Write only the numerical value below (without units) using the correct number of signihcant hpares. Type your answer Nest