Would the following procedural errors result in an incorrectly high or low calculated percent NaOCl in commercial bleach solution?
A student failed to allow the volumetric pipet to drain completely when transferring the diluted bleaching solution to the Erlenmeyer flask. I get incorrectly low.
A student blew the last drops of solution from the pipet into the volumetric flask when transferring commercial bleaching solution to the flask. I get no effect.
A student began a titration with an air bubble in the buret tip. The bubble came out of the tip after 5 mL of Na2S2O3 solution had been released. I get incorrectly high.
Are these correct because this kind of question confuses me. Thank you!
1 answer
Yes, these answers are correct. In the first case, the student would have transferred less solution than intended, resulting in a lower calculated percent NaOCl. In the third case, the air bubble would have caused the student to add more Na2S2O3 solution than intended, resulting in a higher calculated percent NaOCl.
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