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3. What volume of 0.18M Na2CO3 would neutralize 25ml of the HCL solution?

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    Na2CO3 + 2HCl ==> 2NaCl + H2O + CO2\
    How many mols HCl do you have? That's M x L = ?mols. You don't have a M HCl listed. This is as far as you can go.

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