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    Calculate the pH for a solution prepared by mixing 25mL of 0.02M HNO with 50mL of 0.01M HCl
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    I assume you mean HNO3? If so find how many moles of acid you have altogether - moles = concentration x volume (in dm3)

    then knowing that they are both strong acids we can say that [HA] = [H+]

    finally use the equation pH = -log [H+] to determine pH
 
 
 
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