What is the change in ph after addition of 10.0 ml of 1.0 m sodium hydroxide to 90.0 ml of a 1.0 m nh3/1.0 m nh4+ buffer? [kb for ammonia is 1.8 x 10-5]?

  1. 👍 0
  2. 👎 0
  3. 👁 142
  1. I assume you mean M(molar) and not m(molal).
    First, calculate the pH of the solution before any NaOH is added. Use the Henderson-Hasselbalch equation.
    pH = pKa + log (NH3)/(NH4^+)

    Then calculate the pH after the addition of the NaOH. I would use millimols for this because it makes it easier than using concentration. Technically, you're supposed to use concentration but the volume of the solution cancels so the answer using mmols and the answer using concentration is the same.
    mmols NH3 = mL x M = 90
    mmols NH4^+ = mL x M = 90
    mmols NaOH added = mL x M = 10
    .....NH4^+ + NaOH ==> NH3 + H2O + Na^+

    Plug the E line into the HH equation and solve for pH.
    Subtract the two pH values to find the difference.

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. chemistry

    Sodium metal and water reacts to form hydrogen and sodium hydroxide. If 5.98g of sodium react with water to form .26g of hydrogen and 10.40g of sodium hydroxide, what mass of water was consumed in the reaction?

  2. Chemistry

    A chemistry student needs to standardize a fresh solution of sodium hydroxide. She carefully weighs out of oxalic acid H2C2O4 , a diprotic acid that can be purchased inexpensively in high purity, and dissolves it in 250.mL

  3. Chemistry

    The concentration of a certain sodium hydroxide solution was determined by using the solution to titrate a sample of potassium hydrogen phthalate (abbreviated KHP). KHP is an acid with one acidic hydrogen and a molar mass of

  4. chemistry

    Describe how to prepare a 1M solution of sodium hydroxide from concentrated sodium hydroxide (17.6 M)

  1. science

    Will you please check a few more? Physical change, chemical change or both kinds of change? 1. Sodium hydroxide dissolves in water (both) 2. Hydrochloric acid reacts with sodium hydroxide to produce a salt, water and heat

  2. Science

    When excess carbon dioxide passes into a sodium hydroxide solution it forms sodium carbonate solution calculate the mass of crystals that is produced from 5g of sodium hydroxide in excess water

  3. net ionics for lab

    an experiment was conducted by measuring the change in temperature of solutions after mixing them together. After figuring out the KJ/mol, write a net ionic equation for each mixture 1) hydrochloric acid and sodium hydroxide (net

  4. chemistry

    Solutions of sodium hydroxide cannot be kept for very long because they absorb carbon dioxide from the air , forming sodium carbonate. the unbalanced equation is NaOH(aq) + CO2(g) = Na2CO3(aq) + H2O(l) calculate the number of

  1. Chemistry

    How do you do the question: react 3.50 g of solid sodium metal with water to produce hydrogen gas and sodium hydroxide. If,at the end of the reaction there is 6.8 L of solution, what is the concentration of sodium hydroxide? This

  2. Chemistry

    Complete and balance the following neutralization reactions. then, write the names of all the reactants and all the products in each chemical reaction. A) HNO3 + Al(OH)3 = 3HNO3 + Al(OH)3 -> Al(NO3)3 + 3H2O Reactants: Nitric acid,

  3. Chemistry Help!!

    sodium metal reacts violently with water to produce aqueous sodium hydroxide and hydrogen gas. calculate the enthalpy change for this reaction.

  4. Chemistry

    How many grams of sodium hydroxide, NAOH, are needed to make up 580 ml of 1.50M sodium hydroxide solution?

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