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Acidity of Gastric HCL

Fortissimo
in Biochemistry and Molecular Biology

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In a hospital lab, a 10mL sample of gastric juice, obtained several hours after a meal, was titrated with a 0.1M NaOH to neutrality; 7.2mL of NaOH was required. The patients stomach contained no ingested food or drink, so it is assumed that no buffers were present. What was the pH of the gastric juice?

 

I know it sounds really simple but I'm totally stumped. Could someone point me in the right direction?

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