If the unknown is vinegar (Note 1), pipet 25.00 mL into a 250 mL volumetric flask and dilute to the mark with distilled water. Mix thoroughly and pipet 50,00 mL aliquots into 250 mL conical flasks, Add about 50 mL of water and 2 drops of phenolphthalein (Note 2) to each, and titrate with standard 0,1 M NaOH to the first permanent (30 seconds) pink color, Raport the acidity of vinegar as percantage (w/v) CHCOOH (60,053g.mol).

Calculate the student's experimental value of R. Round your answer to four places after the decimal.Must use the table's information and the equation (picture attached) to find the experimental value of R.

Which of the following is NOT true about constant weighing in the experiment? It involves a cycle of heating, cooling, and weighing. A desiccator is used to avoid moisture to В be absorbed by the sample. A proportionality constant will be c) multiplied to the measured weight to account for loss of water. Constant weight is achieved when two D) consecutive measured weights agree within plus or minus 0.3 mg.

Which of the following statements is false? * Chromatographic analysis is independent of film thickness Thick films are used with highly volatile analytes because such films retain solutes for a longer time, thus providing a greater time for separation to take place. Thin films are useful for separating species of low volatility in a reasonable length of time. Which of the following is true about a chromatogram? * The signal is plotted as a function of time or volume of the added mobile phase The position of the peak can be used to quantitatively identify the components of the sample The area under the peak provides qualitative measure of the amount of each component The following are characteristics of an ideal GC detector except-* A temperature range from room temperature to at least 400°C. A long response time independent of flow rate. Adequate sensitivity