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Another buffer solution - practicing exam questions - need help Watch

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    An aqueous solution which contains 0.055 Mol of a weak acid, HA, and 0.025 Mol of NaA. in 100cm3 of a solution has a ph of 4.20. Calculate the ph of the solution formed when 10cm3 of 0.130moldm-3 sodium hydroxide are added to 100cm3 of the buffer described above.
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    (Original post by Pepper111)
    An aqueous solution which contains 0.055 Mol of a weak acid, HA, and 0.025 Mol of NaA. in 100cm3 of a solution has a ph of 4.20. Calculate the ph of the solution formed when 10cm3 of 0.130moldm-3 sodium hydroxide are added to 100cm3 of the buffer described above.
    What have you tried?

    I get a pH of 4.87
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    I get 4.23.

    But I reserve the right to withdraw my answer, if proven incorrect, on the grounds that I am sleepy.
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    (Original post by Pepper111)
    An aqueous solution which contains 0.055 Mol of a weak acid, HA, and 0.025 Mol of NaA. in 100cm3 of a solution has a ph of 4.20. Calculate the ph of the solution formed when 10cm3 of 0.130moldm-3 sodium hydroxide are added to 100cm3 of the buffer described above.
    I make it pH 4.23
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    Huzzah.
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    (Original post by Pigster)
    Huzzah.
    (Original post by charco)
    I make it pH 4.23
    Yeah I can't add...
 
 
 
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