36 gram of marble containing 50% CaCO₃ is allowed to react with 50 gram of concentrated acid containing 36.5% of HCl by mass. Find the mass of NaOH required to absorb the whole CO₂ as Na₂CO
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If you are working from the label data you always use the lower end of the range. If the concentration is important to your work then you run an assay on the HCl to obtain the true concentration.
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