I have a chem final next week and I have a question I am stuck on....
I have a chem final next week and I have a question I am stuck on. If you solve, please explain the steps. I will 'like' your response. Thanks in advance!
1. Calculate how many mL of 0.10M KOH must be added to 100.0mL of 0.20M formic acid solution to make a pH = 3.50 buffer. pKa(HCOOH) = 3.74
I keep getting 115mL by plugging in all given info to the equation pH=pka+log(b/a) and solving for x then converting to L then to mL. But the correct answer is 73mL. In her explanation, she uses an ICE table to get concentration of acid and plugs that into the equation (ends up being 20mml-x) and solving for x. But I don't know why she does that or why my method didn't work. Any insight you have is much appreciated!
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I have a chem final next week and I have a question I am stuck
on....
Problem Set 16 CHEM 1252 November 13, 2019 2. Consider the titration of 60.0 mL of...
Problem Set 16 CHEM 1252 November 13, 2019 2. Consider the titration of 60.0 mL of 0.024 M NaOH with 0.036 M HCI. write the net lonication for the Histor i cading physical states. What is the eldrons p between this reaction and an antalysis reaction Given this retro what is the equilibrium constant for the titration reaction and why can we safely assume that it woes completion"7 Why should you expect the pH to equal 7.00 at the equivalence...
Please help with d-g TITRATIONS CHEM 2. 20.00 mL of 0.270 M HA (K. = 7.2...
Please help with d-g
TITRATIONS CHEM
2. 20.00 mL of 0.270 M HA (K. = 7.2 x 10-4) was titrated with 0.300 M sodium hydroxide a) Write the titration equation and calculate volume of NaOH needed to reach the equivalence point. mL b) At what volume of the titrant would pH=pKa? Why? c) pH at the equivalence point when the acid and base are neutralized will be -. choose one of these answer choices given below: i) equal to 7...
how it is solved that problem, there it is the answer, but I tried many steps...
how it is solved that problem, there it is the answer,
but I tried many steps and I cant get that results. please provide
step by step. thank you
PH. OF of pH 5.00. Acetic decrease in pH? What Example 6. (a) It is desired to prepare 100 ml of a buffer of pH 5.00 benzoic, and formic acids and their salts are available for use. Which aria be used for maximum effectiveness against increase or decrease in acid-salt ratio...
I am not sure how to approach this question I think I have the correct answer...
I am not sure how to approach this question I think I have the correct answer for number 1 but I am not exactly sure how to apply it to number 2 if number 1 is correct. 1. What is the best range of buffering that is provided when a weak acid is present in a water solution? the best range of buffering that is provided when a weak acid is present in a water solution is a pH of...
Hello. There is a question that I am stuck at, I have no clue how to...
Hello. There is a question that I am stuck at, I have no clue how to do it. It is LONG Accounting Transactions – Hair Today: Charlene Jackson’s business, Hair Today, has been operating in Auckland for the month of February 2020. It is set up as a sole trader. You call in for a haircut, and while she is trimming your hair, she tells you how business is going. “I think it’s going very well,” she says. “Last time...
Doing a Chem Review, these are just study scenarios that I need to have a good...
Doing a Chem Review, these are just study scenarios that I need
to have a good understanding of
6. To determine the concentration of SCN in our saliva, we reacted the SCN in the saliva with Fe' according to the following reaction: We measured the absorbance of the FeSCN and used the absorbance value of the FesCN2 to obtain the concentration of the FesCN2*. This was achieved by measuring the absorbance values of standard FeSCN2+ solutions and constructing a calibration...
I added everything thing. this is the lab question you need to solve. First assigned buffer...
I added everything thing.
this is the lab question you need to solve.
First assigned buffer pH: 2.031 Second assigned buffer pH: 9.171 Available Buffer Systems (acid/ base) pka of Conjugate Acid 2.847 4.757 malonic acid/ monosodium malonate acetic acid/ sodium acetate ammonium chloride/ ammonia triethylammonium chloride/ triethylamine 9.244 10.715 1) Buffer system details: Given pH Name and volume conjugate acid Name and volume conjugate base 2) Calculations for preparation of high capacity buffer system. Introduction In this experiment, you...
According to the instructions page (first picture) are these reactions correct? I got stuck on the...
According to the instructions page (first picture) are these
reactions correct? I got stuck on the second page (third picture)
that is why it is blank. Please help me with the reactions that are
incorrect and the blank ones? No need to write the odors, only the
name of ester and the reaction in form of skeletal structure.
Thanks a lot.
Procedure: Caution: Wear your goggles at all times. Glacial acetic acid and concentrated sulfuric acid are corrosive! 1. Assemble...
Please help with solving Question 1 (A-C) Thank you! Unless otherwise specified in the problem, you...
Please help with solving Question 1 (A-C) Thank you!
Unless otherwise specified in the problem, you may assume that all solutions are at 25°C. 1. 50.0 mL of a pH 6.00 carbonic acid buffer is titrated with 0.2857 M NaOH, requiring 17.47 mL to reach the second equivalence point. a. Calculate the molarity of carbonic acid and bicarbonate in the original buffer. Carbonic acid: Bicarbonate: b. Calculate the pH of the solution after a total of 100.0 mL of 0.2857...
Problem Set 16 CHEM 1252 November 13, 2019 2. Consider the titration of 60.0 mL of 0.024 M NaOH with 0.036 M HCI. write the net lonication for the Histor i cading physical states. What is the eldrons p between this reaction and an antalysis reaction Given this retro what is the equilibrium constant for the titration reaction and why can we safely assume that it woes completion"7 Why should you expect the pH to equal 7.00 at the equivalence...
Please help with d-g
TITRATIONS CHEM
2. 20.00 mL of 0.270 M HA (K. = 7.2 x 10-4) was titrated with 0.300 M sodium hydroxide a) Write the titration equation and calculate volume of NaOH needed to reach the equivalence point. mL b) At what volume of the titrant would pH=pKa? Why? c) pH at the equivalence point when the acid and base are neutralized will be -. choose one of these answer choices given below: i) equal to 7...
how it is solved that problem, there it is the answer,
but I tried many steps and I cant get that results. please provide
step by step. thank you
PH. OF of pH 5.00. Acetic decrease in pH? What Example 6. (a) It is desired to prepare 100 ml of a buffer of pH 5.00 benzoic, and formic acids and their salts are available for use. Which aria be used for maximum effectiveness against increase or decrease in acid-salt ratio...
Doing a Chem Review, these are just study scenarios that I need
to have a good understanding of
6. To determine the concentration of SCN in our saliva, we reacted the SCN in the saliva with Fe' according to the following reaction: We measured the absorbance of the FeSCN and used the absorbance value of the FesCN2 to obtain the concentration of the FesCN2*. This was achieved by measuring the absorbance values of standard FeSCN2+ solutions and constructing a calibration...
I added everything thing.
this is the lab question you need to solve.
First assigned buffer pH: 2.031 Second assigned buffer pH: 9.171 Available Buffer Systems (acid/ base) pka of Conjugate Acid 2.847 4.757 malonic acid/ monosodium malonate acetic acid/ sodium acetate ammonium chloride/ ammonia triethylammonium chloride/ triethylamine 9.244 10.715 1) Buffer system details: Given pH Name and volume conjugate acid Name and volume conjugate base 2) Calculations for preparation of high capacity buffer system. Introduction In this experiment, you...
According to the instructions page (first picture) are these
reactions correct? I got stuck on the second page (third picture)
that is why it is blank. Please help me with the reactions that are
incorrect and the blank ones? No need to write the odors, only the
name of ester and the reaction in form of skeletal structure.
Thanks a lot.
Procedure: Caution: Wear your goggles at all times. Glacial acetic acid and concentrated sulfuric acid are corrosive! 1. Assemble...
Please help with solving Question 1 (A-C) Thank you!
Unless otherwise specified in the problem, you may assume that all solutions are at 25°C. 1. 50.0 mL of a pH 6.00 carbonic acid buffer is titrated with 0.2857 M NaOH, requiring 17.47 mL to reach the second equivalence point. a. Calculate the molarity of carbonic acid and bicarbonate in the original buffer. Carbonic acid: Bicarbonate: b. Calculate the pH of the solution after a total of 100.0 mL of 0.2857...
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