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Find the value of Ka and Pka? Help

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    With the concertration of 1.0 mol dm-3with pH 4.5?

    [H+] = 10-4.5 = 3.16227766*10-5
    Square root 3.16227766*10-5 * 0.001 = 1.77827941 *10-4 = Ka

    -log10(1.77...) = 3.75 = Pka

    I don't really know how to get the values , it was a try
 
 
 
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