Chemistry

posted by .

Calculate the pH of 0.215 M carbonic acid (H2CO3). (HINT: do NOT worry about the second H+ in this acid!)

How would I solve this?

  • Chemistry -

    Carbonic acid is a weak acid.

    H2CO3 + H2O---> HCO3 +H30+

    Initial H2CO3=0.215 M
    Final H2CO3=0.215-x
    Initial HCO3=0
    Final HCO3= x
    Initial H30+=0
    Final H30+= x

    ka=4.3 x 10-7=[H30+][HCO3]/H2CO3]

    4.3 x 10-7=[x][x]/0.215M-x]

    5% rule allows for ignoring -x

    4.3 x 10-7=[x][x]/0.215M]
    sqrt(4.3 x 10-7 *0.215M])=x

    x=H3O+

    pH=-log[H3O+]

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Chemistry

    Provide the name or chemical formula, as appropriate, for each of the following acids: a. hydrobromic acid HBr b. hydrosulfuric acid H2SO4 c. nitrous acid HNO2 d. H2CO3 carbonic acid e. HClO3 chloric acid f. HC2H3O2 acetic acid How'd …
  2. chemistry

    A 0.942 M sample of carbonic acid, H2CO3, has a measured hydronium ion concentration of 6.36 ´ 10–4 M. Calculate the acid-ionization constant of carbonic acid. The equilibrium equation is: H2CO3(aq) + H2O(l) <--><--> …
  3. chemistry (acid-ionization constant)

    A 0.942 M sample of carbonic acid, H2CO3, has a measured hydronium ion concentration of 6.36 ´ 10–4 M. Calculate the acid-ionization constant of carbonic acid. The equilibrium equation is: H2CO3(aq) + H2O(l) <--><--> …
  4. Chemistry(Please help)

    Calculate the concentration of HCO3- in an aqueous solution of 0.0885 M carbonic acid, H2CO3 (aq). I was going to set this up as 0.0885 -x = ?
  5. chemistry

    Carbonic acid, H2CO3, decomposes into water and a gas. Write the molecular equation for this decomposition. Remember to include the states of the reactants and products. Carbonic acid is an aqueous solution.
  6. Chemistry

    What is the hydronium ion concentration in a 0.010M solution of carbonic acid, H2CO3?
  7. Chemistry

    What is the concentration of CO3^-2 in a 0.028M solution of carbonic acid, H2CO3?
  8. Chemistry

    Carbon dioxide dissolves in water to form carbonic acid, which is primarily dissolved CO2. Dissolved CO2 satisfies the equilibrium equation CO2(g) <-> CO2(aq) K=0.032 The acid dissociation constants listed in most standard reference …
  9. College Chemistry - Science

    At room temperature (25°C), 45 mL of a 0.002 M acid solution reacts with 30 mL of a NaOH (aq) solution (pH = 11.95), determine (through calculations) whether the acid is phosphoric acid (H3PO4), acetic acid (CH3COOH), or carbonic …
  10. Chemistry

    How many resonance structures do these following acids have?

More Similar Questions