Chemistry

Can someone please help me answer these questions? Is additional information other than what is given needed to solve? Thanks in advance.

1) Calculate the PH of a buffer containing 0.100 M propanoic acid, HC3H5O2 and .100 M NaC3H502 after the following have been added. Ka for acetic acid is 1.3 x 10^-5.
a. 10.0 mL of 2.0 M HCl (assume no volume change occurs when acid is added)
b. 10.0 mL of 2.0 M NaOH (assume no volume change occurs when base is added)

2) A hydrofluoric acid buffer solution has the following concentrations: [HF] = .18M, [F-]= .51M. If 35mL of .15M NaOH is added to 354 mL of the buffer, what is the resultant pH?

  1. 👍 0
  2. 👎 0
  3. 👁 219
  1. #1 has no volume.
    #2.
    millimols HF = 354 mL x 0.18 = about 64
    mmols F^- = 354 mL x 0.51 = about 180
    added NaOH = 35 mL x 0.15 = about 5

    .........HF + OH^- ==> F^- + H2O
    I........64....0.......180
    add............5..............
    C.......-5....-5.........+5
    E.......59.....0.......185

    Substitute into HH equation and solve for pH. NOTE: My "abouts" are estimates. You need to redo each more accurately.

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. statistics

    A multiple choice test has 3 questions and each question has 3 choices. If Nacho takes this test, what is the probability that he will: (a)answer all questions correctly? (b)answer all questions wrong? (c)answer two questions

  2. Statistics

    1)A quiz consists of 8 multiple choice questions, each with 5 possible answers. If random guesses are made for all 8 questions, find the probability that a student will answer exactly 5 correctly. A. 0.999 B. 0.009 C. 0.990 D.

  3. Math(Factorial)

    A women student is to answer 10 out of 13 questions on a test. Find the number of choices where she must answer: (a) the first two questions; (b) the first or second questions but not both; (c) exactly 3 out of the first 5

  4. Math

    Unit 3 Lesson 5 questions and answers. I need someone to checkmyanswers. Compare the pair of fractions. Use (This question is all 3 questions.) 1. 3/8----------1/4 (answer choices are >,, for 2. it is =, and for 3. it is >. Am I

  1. Medical coding

    Which of the following is true about the ICD-10-CM? A. An eighth character was added. B. There are combination diagnosis/symptom codes. C. There are limited injury codes. D. There's additional information relevant to inpatient

  2. English

    Which of the following is a good test-taking strategy for short-answer questions? 1.If you don’t know the exact answer, don’t write anything. 2.(If you don’t know the exact answer, write down whatever you do know.) 3.Make

  3. stats

    I need help. I am so so lost and need the answers and step by step if possible. I have tried everything but I think I'm just.. having a huge brainfart. I need the answers and the step by step please A quiz consists of 8 multiple

  4. Language arts essay

    Both forest fire and why leaves change color in the fall present factual information. write an essay of your own about one of these essays. in your essay, tell whether the author provided enough information for you to understand

  1. ACCOUNTING ASSIGNMENT

    case from : ACCOUNTING FRAUD WORLDCOM There will be a (7) seven page report,excluding figures, tables, appendices, and references,required for the term paper. The written report must be typed, single sided, and 1.5 lines-spaced.

  2. phys

    To totally convert a given amount of mechanical energy into heat is Choose one answer. a. impossible. b. possible. c. impossible to answer without additional information.

  3. accounting

    identify three external users of accounting information and indicate two questions they might seek to answer through accounting information.

  4. Childhood Education Question

    1.Developing problem solving skills is a product of which approach? conventional,learning,information, or emergent creative 2.A teacher who gives lots of information to her students and asks close-ended questions uses which

You can view more similar questions or ask a new question.