chemistry

Please let me know if my answer to the following question is correct.

Question:
25 mL of standardized 0.45 mol/L NaOH is titrated with 21 mL of 0.35 mol/L acetic acid. Calculate the pH of the solution.

Answer:
Add 25 mL and 21 mL to get 46 mL.
Add 0.45 mol/L and 0.35 mol/L to get 0.8 mol/L.
Divide 0.0046 by 0.8 to get 5.8 x 10^-3.
Since pH = -log[H^+], pH = -log[5.8 x 10^-3] gives the answer to this question, which is a pH of 2.2

  1. 👍 0
  2. 👎 0
  3. 👁 78
  1. Please let me know if my answer is correct.

    Question:
    A weak base with a concentration of 1.3 mol/L has a percent ionization of 0.72%. What is the Kb of this weak base?

    Answer:
    Calling the weak base SHO, SHO --> S^+ plus HO^-.
    I know that the formula for Kb, therefore, will be Kb=(S^+)(HO^-)/SHO, After creating an ICE table, the initial concentration of SHO is equal to 1.3 mol/L.
    H^+ is equal to zero and so is HO^- Regarding the change in concentration, S^+ is equal to +1.3 + 0.0072, HO^- is equal to +1.3 + 0.0072 and SOH^- is equal to 1.3 x 99.28.
    Regarding Equilibrium concentration, S^+ is equal to 1.3 x 0.0072 =?, OH^- is equal to 1.3 x 0.0072 = ? and SOH is equal to 1.3 - (1.3 x 0.0072) or (1.3 x 0.9928 = ?.
    After substituting the equilibrium numbers into Ka expression and calculating Ka,the step is written as follows: Ka=(S^+)(HO^-)/SHO^-
    Subbing in the values gives Ka = (0.00936)(0.00936)/1.29064 gives the value of Ka a value of 6.8 x 10^-5

    1. 👍 0
    2. 👎 0
    posted by Abigail
  2. The acetic acid/NaOH problem is not worked correctly. You can't add the volumes. Each neutralize each other. Try again.

    The second problem, the one for Kb is worked correctly.

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. Statistical concept 68-95-99.7

    1. A student taking a midterm exam in Ancient History comes to two questions pertaining to a lecture that he missed, and so he decides to take a random guess on both questions. One question is true-false and the other is multiple

    asked by Surpreet Pororsha on April 21, 2016
  2. Stat HW for.

    1. A student taking a midterm exam in Ancient History comes to two questions pertaining to a lecture that he missed, and so he decides to take a random guess on both questions. One question is true-false and the other is multiple

    asked by Jen N. on April 21, 2016
  3. Statistics

    On a very short quiz, there is one multiple choice question with 5 possible choices (a, b, c, d, e) and one true or false question. Assume you are taking the quiz but do not have any idea what the correct answer is to either

    asked by Cassie on July 8, 2011
  4. 5th grade social studies

    Question: What time period or movement began in the textile industry? I am really confused about this questions. My answer was the time period of the 18th century. Is this correct? Question: What is an economic system based on

    asked by Lina on October 26, 2010
  5. English

    There are three teams in a classroom. 1. This question is for Team 1. 2. Only Team 2 can answer this question. 2-2. Only students in Team 2 can answer this question. (Do we have to put 'the' before 'students'?) 3. This one is for

    asked by rfvv on November 29, 2016
  6. SPANISH

    Complete the following sentences with the correct answer choice. Estoy __________ un bistec. comer como come comiendo Flag this Question Question 13 5 pts Complete the following sentences with the correct answer choice.

    asked by lilkakes on March 1, 2019
  7. Math

    Can someone please help me to answer the following question? The question below has four choices, but only one correct answer. Could you please help me with the correct answer for this question? Thank you in advance. Question # 1.

    asked by Dave on February 13, 2011
  8. American History

    The reason that the President is called the Commander-in-Chief in the Constitution is because the Framers wanted ***to provide the President with authority over the secretary of defense. Question 2. Question : Thomas Jefferson

    asked by POL201 on April 6, 2015
  9. algebra

    Need some one check my homework. Evaluate 3p/q when p=2 and q=6. Answer:1 Use < > or = for __ to write a true sentence: 0.001 __ 0.0010 Answer:< Question 3 Evaluate -3/8 - 5/8. Answer:7 Question 4 Evaluate: 84 + (-99) + 44 - (-18)

    asked by Lisa on May 29, 2014
  10. English

    Posted by rfvv on Sunday, April 10, 2011 at 9:51pm. He asked me a question. He asked a question of me. He begged me a question. He begged a question of me. He inquired me a question. He inquired me of a question. (Are the pairs

    asked by rfvv on September 24, 2015
  11. Math

    A multiple choice quiz contains five question. Each question has four answer choices. Michael is not prepared for the quiz and decides to guess for each question. What is the probability that Michael will get at least one question

    asked by Ashley on April 29, 2013

More Similar Questions