Homework Answers
Solution:
Before addition of NaOH, the pH of the solution contains only HCN.
HCN is a weak acid, it is dissociated in water as:
HCN + H2O = CN- + H3O+
0.421 M --------0.0M--------0.0M (initial)
0.421 -X-----------X-------------X (at equilibrium)
Ka = X .X / 0.421 - X
HCN is a weak acid, therefore, X will be very small in comparison of 0.421 M
Hence, Ka = X . X / 0.421
Ka for HCN = 6.2 x 10^-10
6.2 x 10^-10 = X2 / 0.421M
X2 = 2.61 x 10^-10
X = √2.61 x 10^-10
X= 1.62 x 10^-5 M
Add Answer to:
Use the References to access important values if needed for this question. A 20.4 mL sample...
Use the References to access important values if needed for this question When a 18.3 ml...
Use the References to access important values if needed for this question When a 18.3 ml sample of a 0.314 M aqueous acetic acid solution is titrated with a 0.384 M aqueous sodium hydroxide solution, what is the pH at the midpoint in the titration? pH- Submit Answer Retry Entire Group 8 more group attempts remaining Previous Nerd Save and Cengage Learning Cengage Technical Support Use the References to acces important values if needed for this question. A 37.6 mL...
Use the References to access important values if needed for this question. When a 22.0 mL...
Use the References to access important values if needed for this question. When a 22.0 mL sample of a 0.356 M aqueous acetic acid solution is titrated with a 0.397 M aqueous sodium hydroxide solution, what is the pH at the midpoint in the titration? pH-
Use the References to access important values if needed for this question. When a 21.8 mL...
Use the References to access important values if needed for this question. When a 21.8 mL sample of a 0.479 M aqueous nitrous acid solution is titrated with a 0.417 M aqueous barium hydroxide solution, what is the pH after 18.8 mL of barium hydroxide have been added?
| | a search signmen 110% Review Topics References Use the References to access important values...
| | a search signmen 110% Review Topics References Use the References to access important values if needed for this question. A 48.7 mL sample of a 0.540 M aqueous hypochlorous acid solution is titrated with a 0.397 M aqueous sodium hydroxide solution. What is the pH after 45.4 mL of base have been added? pH- Submit Answer Rety Entire Group 1 more group attempttemaining
References Use the References to access important values if needed for this question. An aqueous solution contains...
References Use the References to access important values if needed for this question. An aqueous solution contains 0.456 M nitrous acid. How many mL of 0.3 10 M sodium hydroxide would have to be added to 125 mL of this solution in order to prepare a buffer with a pH of 3.290? mL Submit Answer References Use the References to access important values if needed for this question. solution contains 0.489 M ethylamine (C2H5NH2). An aqueous How many mL of...
Titration curve question: 1) A 22.6 mL sample of a 0.394 M aqueous hydrocyanic acid solution...
Titration curve question: 1) A 22.6 mL sample of a 0.394 M aqueous hydrocyanic acid solution is titrated with a 0.496 M aqueous sodium hydroxide solution. What is the pH at the start of the titration, before any sodium hydroxide has been added? pH = __ 2) A 28.1 mL sample of 0.212 M dimethylamine, (CH3)2NH, is titrated with 0.325 M perchloric acid. The pH before the addition of any perchloric acid is ___ . Use the Tables link in...
A 25.2 mL sample of a 0.446 M aqueous acetic acid solution is titrated with a...
A 25.2 mL sample of a 0.446 M aqueous acetic acid solution is titrated with a 0.415 M aqueous sodium hydroxide solution. What is the pH at the start of the titration, before any sodium hydroxide has been added? pH = What is the pH at the equivalence point in the titration of a 27.7 mL sample of a 0.360 M aqueous hydrocyanic acid solution with a 0.372 M aqueous sodium hydroxide solution? pH =
this question. When a 21.0 mL sample of a 0.411 M aqueous hydrocyanic acid solution is...
this question. When a 21.0 mL sample of a 0.411 M aqueous hydrocyanic acid solution is titrated with a 0.300 M aqueous barium hydroxide solution, what is the pH after 21.6 mL of barium hydroxide have been added? PH Submit Answer Retry Entire Group 5 more group attempts remaining What is the pH at the equivalence point in the titration of a 23.3 ml sample of a 0.347 M aqueous hypochlorous acid solution with a 0.395 M aqueous barium hydroxide...
References Use the References to access important values if needed for this question. The following pH curve is for the...
References Use the References to access important values if needed for this question. The following pH curve is for the titration of 20.0 mL of a 0.10 M solution of a weak monoprotic acid with a 0.10 M solution of a strong monoprotic base. 14.07 ܠܬ ܬܬ ܬܬ ܬܬ ܬܬ ܬܬ ܬ ܫܢ Handtattoo 0.0 10.0 20.0 30.0 Volume of titrant (mL) 40.0 50.0 Data points at 1 mL increments. (a) What is the pH before any titrant has been...
References Use the References to access important values if needed for this question. A 28.2 mL sample of 0.304 M dimet...
References Use the References to access important values if needed for this question. A 28.2 mL sample of 0.304 M dimethylamine, (CH),NH, is titrated with 0.247 M hydroiodic acid. At the equivalence point, the pH is Use the Tables link in the References for any equilibrium constants that are required. Submit Answer References Use the References to access important values if needed for this question. A 23.6 mL sample of 0.249 M dimethylamine, (CH),NH, is titrated with 0.207 M hydrobromic...
Use the References to access important values if needed for this question When a 18.3 ml sample of a 0.314 M aqueous acetic acid solution is titrated with a 0.384 M aqueous sodium hydroxide solution, what is the pH at the midpoint in the titration? pH- Submit Answer Retry Entire Group 8 more group attempts remaining Previous Nerd Save and Cengage Learning Cengage Technical Support Use the References to acces important values if needed for this question. A 37.6 mL...
Use the References to access important values if needed for this question. When a 22.0 mL sample of a 0.356 M aqueous acetic acid solution is titrated with a 0.397 M aqueous sodium hydroxide solution, what is the pH at the midpoint in the titration? pH-
| | a search signmen 110% Review Topics References Use the References to access important values if needed for this question. A 48.7 mL sample of a 0.540 M aqueous hypochlorous acid solution is titrated with a 0.397 M aqueous sodium hydroxide solution. What is the pH after 45.4 mL of base have been added? pH- Submit Answer Rety Entire Group 1 more group attempttemaining
References Use the References to access important values if needed for this question. An aqueous solution contains 0.456 M nitrous acid. How many mL of 0.3 10 M sodium hydroxide would have to be added to 125 mL of this solution in order to prepare a buffer with a pH of 3.290? mL Submit Answer References Use the References to access important values if needed for this question. solution contains 0.489 M ethylamine (C2H5NH2). An aqueous How many mL of...
this question. When a 21.0 mL sample of a 0.411 M aqueous hydrocyanic acid solution is titrated with a 0.300 M aqueous barium hydroxide solution, what is the pH after 21.6 mL of barium hydroxide have been added? PH Submit Answer Retry Entire Group 5 more group attempts remaining What is the pH at the equivalence point in the titration of a 23.3 ml sample of a 0.347 M aqueous hypochlorous acid solution with a 0.395 M aqueous barium hydroxide...
References Use the References to access important values if needed for this question. The following pH curve is for the titration of 20.0 mL of a 0.10 M solution of a weak monoprotic acid with a 0.10 M solution of a strong monoprotic base. 14.07 ܠܬ ܬܬ ܬܬ ܬܬ ܬܬ ܬܬ ܬ ܫܢ Handtattoo 0.0 10.0 20.0 30.0 Volume of titrant (mL) 40.0 50.0 Data points at 1 mL increments. (a) What is the pH before any titrant has been...
References Use the References to access important values if needed for this question. A 28.2 mL sample of 0.304 M dimethylamine, (CH),NH, is titrated with 0.247 M hydroiodic acid. At the equivalence point, the pH is Use the Tables link in the References for any equilibrium constants that are required. Submit Answer References Use the References to access important values if needed for this question. A 23.6 mL sample of 0.249 M dimethylamine, (CH),NH, is titrated with 0.207 M hydrobromic...
Most questions answered within 3 hours.
-
Where is the error in this code sequence?
String s1 = "Hello";
String s2 = "ello";...
asked 10 months ago -
Financial data for Joel de Paris, Inc., for last year
follow:
Joel de Paris, Inc.
Balance...
asked 10 months ago -
Consider this reaction:
Al2(SO4)3 (aq)+ BaCl3
(aq) Al2Cl6 (aq)- +
3BaSO4(s) . What is the...
asked 10 months ago -
Suppose that Savneet is considering increasing her
recent random sample from 20 car rentals to 40...
asked 10 months ago -
Trucks arrive at an unloading terminal at an average rate of 120
per hour.
Trucks arrive...
asked 10 months ago -
Why are methanol and ethanol completely soluble in water while
octanol is not very little soluble....
asked 10 months ago -
A facilities manager at a university reads in a research report
that the mean amount of...
asked 10 months ago -
When the CuSO4 is rehydrated by adding water to the anhydrous
compound, is this an endothermic...
asked 10 months ago -
A ray of sunlight is passing from diamond into crown glass; the
angle of incidence is...
asked 10 months ago -
A block of mass 0.249 kg is placed on top of a light, vertical
spring of...
asked 10 months ago -
how do the kidneys compensate in the presences of acidosis
a) trigger hyperventilate
b) reserve acid...
asked 10 months ago -
Question 501 pts
The rental rate of capital to the firm increases. Which of the
following...
asked 10 months ago