Diet and blood pressure An experiment that showed that subjects fed the DASH diet were able to lower their blood pressure by an average of 6.7 points compared to a group fed a control diet. All meals were prepared by dieticians. a) Why were the subjects randomly assigned to the diets instead of letting people pick what they wanted to eat? b) Why were the meals prepared by dieticians? c) Why did the researchers need the control group? If the DASH diet groups blood pressure was lower at the end of the experiment than at the beginning, wouldnt that prove the effectiveness of that diet? d) What additional information would you want to know in order to decide whether an average reduction in blood pressure of 6.7 points was statistically significant?
Lab 2 – Titration 1 Titration allows the quantitative determination of one compound’s concentration by reaction with a precisely known quantity of a second reagent The titration reaction must go essentially to completion when forming products Most common titrations are performed with solutions because liquid volumes are easy to measure with high precision and accuracy/because solutions tend to mix rapidly and form homogenous products Lab process: determine the concentration of an NaOH solution by titrating it with a known mass of the compound potassium hydrogen phthalate (KHP), which as a single acidic proton which reacts with the OH ion rapidly and quantitatively o KHP can be weighed and used in ti