Question

To prevent waste. a chemistry department converted a lab procedure to a microscale version. Feedback < Solid sodium hydroxide as well as a 1 M sodium hydroxide solution are used in the procedure. You have not correctly calculated the The total quantity of NaOH used by one pair of students for this lab is given in the table. There are 188 students in the course. total mass of NaOH saved. You entered the mass of solid NaOH Reagent Large scale quantity Microscale quantity saved, but you did not include the 3.61 g NaOH L.17g amount of NaOH in the solution. 1M NaOH 96.6 mL 13.3 mL Use the concentration of the solution Calculate the total mass of NaOH saved by converting the procedure to a microscale version. and the molar mass of NaOH to find the mass of NaOH in the solution. Given that the density of solid NaOH is 2.13 g/em, which total mass of NaOH saved 230 beaker size would best hold the NaOll saved? 50 ml O 100 mL O 200 ml 300 ml

Answer 1

pair of students Amocent of solid nach saved by =(361g - 1 179) = 2.ung Amount of NaOH scured from IM NooH from JooH scured 96.6m - 132 ml = 83.3ml wt of NaOH reeds to be calculated - 1 Molar NooH = wt of Nach x 1000 Melecutor wt of NaoH 83.3 modlit усло) - wt of NaoH = 40x83.3 gm. 1000 - wt of woch = 3.332g Thus total NagH scured by 1-paris of s Qiu4g + 3.332 g) = 5.7929 Now, there are 188 studente or au pairs of students. Hence total NaOH scured =542.568 9 orn542.6 g we know density is ratio of maus to volume - Nolume = mace of Naoh sowed density of Nach 542.6 g 2:13g/ml 3 Volume = 254.74 ml Thus the best hold beakey size is zoom