you titrated an unknown acid with 0.0925 M NaOH, 0.6201g of the unknown acid was placed into an Erlenmeyer flask with10...
you titrated an unknown acid with 0.0925 M NaOH, 0.6201g of the unknown acid was placed into an Erlenmeyer flask with10 ml of water and 2-3 drops of phenolphthalein. It took 32.34ml of NaOH to reach the endpoint. What is the pKa of the unknown acid? pH at endpoint is 7.19.
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The answer is given in the attachment .
![for a weak and strong base firation the equivalence ponk is refered by pH=pka (pH=7+ plato log Isalt] > {pha= pH-7-blog [kalt](http://img.homeworklib.com/questions/7a470d20-074c-11ea-99ef-5d71409e85f4.png?x-oss-process=image/resize,w_560)
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you titrated an unknown acid with 0.0925 M NaOH, 0.6201g of the unknown acid was placed into an Erlenmeyer flask with10...
you titrated an unknown acid with 0.0925 M NaOH, 0.6201g of the unknown acid was placed...
you titrated an unknown acid with 0.0925 M NaOH, 0.6201g of the unknown acid was placed into an Erlenmeyer flask with10 ml of water and 2-3 drops of phenolphthalein. It took 32.34ml of NaOH to reach the endpoint. What is the molecular weight and the pKa of the unknown acid?
A sample of KHP weighing 0.503 grams was placed in an Erlenmeyer flask and 100 m distilled water was added to disso...
A sample of KHP weighing 0.503 grams was placed in an Erlenmeyer flask and 100 m distilled water was added to dissolve the acid. Two drops phenolphthalein were added and a light pink endpoint was observed after the addition of 27.3 ml NaOH. What is the Molarity of the NaOH solution? Select one: O a. 0.09 M O b. 0.06 M O C. 0.07 M O d. 0.02 M
22. Acetic acid, CH,COOH, is placed in an Erlenmeyer flask and titrated with NaOH solution. Sketch...
22. Acetic acid, CH,COOH, is placed in an Erlenmeyer flask and titrated with NaOH solution. Sketch a titration curve. Your graph should have the value of 7 indicated on the pH-axis. Show the following on the graph. a. Equivalence point b. Half-equivalence point c· The region with the maximum buffering effect d. The point where pH-pKa e. The point where [CH,COOH [CH COO] f. The region where pH is controlled by the excess of a strong base
16. Exactly 25.00 ml of 0.0685 M HClO4 solution is placed in a flask and titrated...
16. Exactly 25.00 ml of 0.0685 M HClO4 solution is placed in a flask and titrated with standardized 0.050M NaOH. A. Determine the endpoint of the titration B. Determine the pH of the solution after the following amounts of NaOH are added to the acid solution: a.) Initially, 0.00 ml NaOH. b.) 5.00 ml c.) 15.00 ml d.) 25.00 ml e.) 34.00 ml f.) At the endpoint of the titration g.)...
Exactly 25.00 ml of a 0.0685 M pentanoic acid solution,(C4H8O2), is placed in a flask and...
Exactly 25.00 ml of a 0.0685 M pentanoic acid solution,(C4H8O2), is placed in a flask and titrated with standardized 0.050 M NaOH. (the pKa of this acid is 4.84). A. Determine the endpoint of the titration B. Determine the pH of the solution after the following amounts of NaOH are added to the acid solution: a.) Initially, 0.00 ml NaOH. b.) 5.00 ml c.) 15.00 ml d.) 25.00 ml e.) 34.00 ml...
3. A student pipetted 25.00 mL of a 0.2531 M solution of HCl into an Erlenmeyer...
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Question 2 (10 points) If 25.0 mL of 0.451 M NaOH solution is titrated with 0.253...
Question 2 (10 points) If 25.0 mL of 0.451 M NaOH solution is titrated with 0.253 MH2SO4, the flask at the endpoint will contain (besides the indicator phenolphthalein) as the principal components: sodium hydroxide, sulfuric acid, and water dissolved sodium sulfate and water sodium hydroxide, sodium sulfate, and water dissolved sodium sulfate, sulfuric acid, and water precipitated sodium sulfate and water Question 3 (10 points) A 75.0-ml sample of 0.0650 MHCN (K-62 10-10) is titrated with 0.65 M NaOH. What...
An unknown acid salt was dissolved in water and titrated with 0.105 M NaOH. If 1.20...
An unknown acid salt was dissolved in water and titrated with 0.105 M NaOH. If 1.20 grams of the salt were dissolved and it took 120 mL to reach the equivalence point, what is the unknown? ( )NaF ( ) NH4Cl ( ) (CH3)3NHCl ( ) NaHCO3
Assume that a 50.00 mL sample of 0.1000 M HCl in an Erlenmeyer flask is titrated...
Assume that a 50.00 mL sample of 0.1000 M HCl in an Erlenmeyer flask is titrated with 0.1000 M NaOH. (a) What is the initial pH before any base is added? (6) What is the pH of the solution after 10.00 mL of NaOH? (c) What is the pH of the solution after 20.00 mL of NaOH? (d) What is the pH of the solution after 50.00 mL of NaOH? (e) What is the pH of the solution after 60.00...
Could you please help me with 1) and 3)! A 25.0 mL sample of an unknown acid in water is titrated with 0.1 MNaOH (aq) an...
Could you please help me with
1) and 3)!
A 25.0 mL sample of an unknown acid in water is titrated with 0.1 MNaOH (aq) and resulted in the following data. Note: phenolphthalein indicator and a pH probe were used to monitor pH Volume (mL) 0.1 M NaoH obse pH Observed colour 3.15 3.56 2.5 3.96 4.43 7.5 8.16 10 12.5 11.32 12.09 15.0 17.5 12.37 20.0 12.61 22.5 12.81 25.0 12.86 12.89 27.5 12.91 30.0 Based on the data...
A sample of KHP weighing 0.503 grams was placed in an Erlenmeyer flask and 100 m distilled water was added to dissolve the acid. Two drops phenolphthalein were added and a light pink endpoint was observed after the addition of 27.3 ml NaOH. What is the Molarity of the NaOH solution? Select one: O a. 0.09 M O b. 0.06 M O C. 0.07 M O d. 0.02 M
22. Acetic acid, CH,COOH, is placed in an Erlenmeyer flask and titrated with NaOH solution. Sketch a titration curve. Your graph should have the value of 7 indicated on the pH-axis. Show the following on the graph. a. Equivalence point b. Half-equivalence point c· The region with the maximum buffering effect d. The point where pH-pKa e. The point where [CH,COOH [CH COO] f. The region where pH is controlled by the excess of a strong base
3. A student pipetted 25.00 mL of a 0.2531 M solution of HCl into an Erlenmeyer flask. After adding 3 drops of phenolphthalein indicator to the flask, the student started adding NaOH from the burette, until the color in the Erlenmeyer flask turned light pink, The student calculated that 21.40 mL NaOH was transferred in the flask to neutralize the acid. a) Calculate the number of moles of HCl initially present (Reaction: NaOH(aq) + HCl(aq) -NaCl(aq) + H2O() b) Calculate...
Question 2 (10 points) If 25.0 mL of 0.451 M NaOH solution is titrated with 0.253 MH2SO4, the flask at the endpoint will contain (besides the indicator phenolphthalein) as the principal components: sodium hydroxide, sulfuric acid, and water dissolved sodium sulfate and water sodium hydroxide, sodium sulfate, and water dissolved sodium sulfate, sulfuric acid, and water precipitated sodium sulfate and water Question 3 (10 points) A 75.0-ml sample of 0.0650 MHCN (K-62 10-10) is titrated with 0.65 M NaOH. What...
Assume that a 50.00 mL sample of 0.1000 M HCl in an Erlenmeyer flask is titrated with 0.1000 M NaOH. (a) What is the initial pH before any base is added? (6) What is the pH of the solution after 10.00 mL of NaOH? (c) What is the pH of the solution after 20.00 mL of NaOH? (d) What is the pH of the solution after 50.00 mL of NaOH? (e) What is the pH of the solution after 60.00...
Could you please help me with
1) and 3)!
A 25.0 mL sample of an unknown acid in water is titrated with 0.1 MNaOH (aq) and resulted in the following data. Note: phenolphthalein indicator and a pH probe were used to monitor pH Volume (mL) 0.1 M NaoH obse pH Observed colour 3.15 3.56 2.5 3.96 4.43 7.5 8.16 10 12.5 11.32 12.09 15.0 17.5 12.37 20.0 12.61 22.5 12.81 25.0 12.86 12.89 27.5 12.91 30.0 Based on the data...
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