A student 發問於 科學及數學化學 · 1 十年前

Strong/weak of acid/bases

Strong acid = donate H+

Weak acid = refuses to donate H+

Strong base = accept H+

Weak base = refuses to accept H+

Therefore, how do weak acid and weak base damage things? acid will damage base; base will damage acid. How does it work if they ( weak acid and base ) damage eachother??

更新:

In this formular: eg of weak base: NH3 + H2O ---- NH3+ + OH-

Where did the another H+ went to?

2 個解答

評分
  • 1 十年前
    最愛解答

    strong acid donates H+, and weak acid doesn't refuse to donate H+, weak acid also donates H+. no matter strong acid or weak acid, when a substance in solution produces hydrogen ions, H+, it's called acid.

    the difference between strong acid and weak acid is:

    when an acid dissolved in water, and all of its molecules are ionised competely, it called strong acid; if an acid dissolved in water and only some of its molecules are ionised, it called weak acid.

    eg of strong acid: HCl ---> H+ + Cl- (ionised competely)

    eg of weak acid: CH3COOH ----> H+ + CH3COO- (ionised partially)

    a base combines with the hydrongen ion of an acid, but without producing hydrogen gas.

    when a base dissolved in water, all of its molecules are ionised competely, it is strong base; for weak base, only some of its molecules are ionised.

    eg of strong base: NaOH ---> Na+ + OH-

    eg of weak base: NH3 + H2O ----> NH3+ + OH-

    when an acid mix/reacts with a base, we don't call it's damaged, people called neutralisation. Neutralisation is: the H+ of an acid is removed by a base.

    the neutralisation reaction is: OH- + H+ ----> H2O

    eg of (full reaction) neutralisation: HCl + NaOH ----> NaCl + H2O

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  • 1 十年前

    NH3 + H2O ----> NH4+ + OH-

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