Chemistry

posted by .

Sodium Carbonate is said to be a strong base however when in aqueous solution it doesn't yield OH^- ions so how can we say its a base.
Or do we say its a base because of its PH.

  • Chemistry -

    The solution does yeild OH- ions as it is the salt of a strong base and weak acid.

    Consider the two equilibria

    H2O <-> H+ + OH-...........(1)

    H2CO3 <-> 2H+ + (CO3)2-....(2)

    when Na2CO3 is added to water it is a salt and totally dissociates to Na+ and (CO3)2- ions.

    The carbonate ions then immediately set up the equilibrium in equation (2). This equation lies to the left as I have drawn it, i.e. it is a weak acid and not totally dissociated. So in order to form th un-ionised acid it must remove H+ from the equilibrium in equation (1), and in doing so forces the equilibrium in equation (1) to the right to produce more OH-. Hence the solution contains OH- ions and is highly alkaline.

    "Sodium carbonate is said to be a strong base" in the sense that the salt is totally dissociated.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. CHEMISTRY

    HOW CAN U TELL IF HNO3 +KNO3 IS A BUFFER SOLUTION A buffer solution must contain a weak acid and its conjugate base OR a weak base and its conjugate acid. HNO3 is a strong base and KNO3 is the salt of a strong base (KOH) and a strong …
  2. Chemistry

    If an equal number of moles of the weak acid HOCN and the strong base KOH are added to water, the resulting solution will be acidic, basic or neutral?
  3. CHEMISTRY

    Methylamine (CH3NH2) forms hydroxide ions in aqueous solution. Why is methylamine a Brønsted-Lowry base but not an Arrhenius base?
  4. College Chemistry

    Sodium hydroxide is used extensively in acid-base titrations because it is a strong inexpensive base. A sodium hydroxide solution was standardized by titrating 27 mL of 0.1628 M standard hydrochloric acid. The initial buret reading …
  5. 1 chem question

    A base has a Kb of 2.5 x 10–11. Which of the following statements is true?
  6. Chemistry

    A base has a Kb of 2.5 x 10–11. Which of the following statements is true?
  7. Chemistry

    A base has a Kb of 2.5 x 10–11. Which of the following statements is true?
  8. AP Chemistry

    A solution is prepared by titrating a 100.0 mL sample of 0.10 M HF (Ka = 7.2 × 10-4) with 0.10 M NaOH a. Does the solution contain a strong acid with a strong base, a strong acid with a weak base, a weak acid with a strong base, or …
  9. AP Chemistry

    A solution is prepared by titrating a 100.0 mL sample of 0.10 M HF (Ka = 7.2 × 10-4) with 0.10 M NaOH a. Does the solution contain a strong acid with a strong base, a strong acid with a weak base, a weak acid with a strong base, or …
  10. SCIENCE PLZZ HELP!!!

    Given equal concentrations, which of the following produces the fewest hydronium ions in an aqueous solution?

More Similar Questions