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How much 1.0 mol/L HCL would you need to add to 1 L of an imaginary buffer of 0.10 mol/L to change the pH from 6.8 to 6.0. (Neglect volumes and remember that HCL disassociates completely)

(About the buffer= triprotonic weak acid with pK1= 2.0, pK2 7.5, pK3= 12)

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