Chemistry

posted by .

An ion exchange process may be used to remove ions causing hardness of water.
Outline how this works.

1. Ca2+ and Mg2+ are the ions that cause the hardness of water, one example of softening the water is to react the hard water with NaCO3 (Sodium bicarbonate) to soften the water. I don't know how to get the equation to explain this, and how the ion exchange process works to remove the ions.

2. I know how to get rid of the Ca2+ ions, but I don't know if it's enough.

Ca(2+) + 2HCO3(-) --> Caco3 + H2O +CO2
[calcium ion, reacts with bicarbonate to produce calcium carbonate (precipitant), water and carbon dioxide]

:S

  • Chemistry -

    It is enough.

    read about ion exchange.
    http://en.wikipedia.org/wiki/Ion_exchange
    Ca is trapped in the zeolite, and then periodically, Na is flushed in to remove the Ca ion (goes off in excess NaCl wastewater). when recharged, the zeolite again traps Ca and Mg ions.

  • Chemistry -

    I might point out that Na2CO3 is sodium carbonate and not sodium bicarbonate (which is NaHCO3).

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Analytical Chemistry

    Predict the effect (Increase, Decrease, No effect, Indeterminate)and explain why 1. Condition: In the determination of water hardness, the water sample contained appreciable amount of ferric ions Paameter: ppm CaCO3 2. Condition: Instead …
  2. 10th grade chemistry

    We're doing a lab report on the hardness of water, and one of the calculations is "The EDTA reacts with the hard water ions in a 1:1 mole ratio. Calculate the molarity of the ions present in 20 mL of water tested." How would you do …
  3. chemistry

    A 100.0 mL sample of hard water is titrated with the EDTA solution from Part 2. The same amount of Mg2+ is added as previously, and the volume of EDTA required is 22.44 mL What volume of EDTA is used in titrating the Ca2+ in the hard …
  4. Chemistry

    Sea water conducts electricity. Which statements give the best explanation for this a) Ions are able to move around in sea water b) Electrons can pass from ion to ion in the sea water c) The sea water contains more ions with positve …
  5. chemistry

    25.0 mL tap water is titrated with 0.00500 M EDTA 7.95mL EDTA is required for complete reaction with water hardness what is the molarity of the total water hardness
  6. CHEM AB HELP ASAP

    I have a pre lab questions that are due in a few hours and I need help. Theres several questions In the titration of 25.00 ml of a water sample, it took 20.590 ml of 4.995x10-3 M EDTA solution to reach the endpoint. The total hardness …
  7. CHEM HELP RIGHT NOW PLEASE

    n the titration of 25.00 ml of a water sample, it took 20.590 ml of 4.995x10-3 M EDTA solution to reach the endpoint. Complete the questions below: Calculate the number of moles of EDTA required to titrate the water sample. (enter …
  8. Science Question

    Which of the following statements best describes what is happening in a water softening unit?
  9. chem 15

    The hardness of water (hardness count) is usually expressed as parts per million (by mass) of calcium carbonate. What is the molar concentration of calcium ions in a water sample with a hardness count of 175ppm?
  10. Chemistry

    Hardness is defined as calcium and magnesium ion content. Since most hardness is caused by carbonate mineral deposits and does not distinguish calcium and magnesium ions, hardness is usually reported as parts per million (ppm) of calcium …

More Similar Questions