Question

In this experiment, everyone individually examined the solubility of oxalic acid by vi- sually determining when crystals form in solution. Do you think if you and your neigh- bor had the same mass of solute and same volume of solvent that you would record the same temperature at which crystals form? What type of error would result if the data from multiple scientists was combined? POTASSIUM DICHROMATE DATA Data provided in pre-lab for water as a solvent (obtained before arriving for Day 2) Mass of sample, g5.0 636 Temp at Which Crystals Form (°C) Concentration Total Volume (g Solute/100 g Solvent) Mole Fraction (mL) 45.4 45 3 C 6. O mb 12.64ML 20. 72mL 30.1 C 34.69 15.3 C 13

Answer 1

Concentrabon Soluli/100g Solvent) o.8a3 Moufrachion, ump at wntb iotal volui Gys tals foam (°c) (mL) o:14(33 6s.4°c 6.08 mL o.01887 o-396 l2. 64 mL 4S.3°c o. 04 607 o.24 30.7°c 20.72 mL o. 0280 4 I5. 3 °c O.144 34. 69 mL Mais of Sampl LOnen tration veemefolictorn mais of solvent x va umezmeK olengiy fo water, here water is Solvent mals= volume. chnanrty gImd 50036 g Lonentrahon 0.8229 S 6.08 Coneen tvahon S.00263 0.39 S8S (3) LonuntrYatin Oa 144 237 Lonentradon 4 34.69g fractt on componint 1 moles of Mole of 13t Lomp cund total moles no of of all compounds Nu - -.au+U in total Psent ponepls LOm are

5.0036 90. 03glmol 0.05 S6 mol giren moles mass o.f no. a/mo) Oxalic aud mo lan masS glmol 90- 03 molar mass Oxal'c aud 6.08 9 o. 3378 mols no of moles cvat ea glmol Imol hass 1g wade mala 07022 mols (a 18.64 water of moles no gmo l.ISII moLs water moles no of gmol mdle cwat e 4) c no. of Mous of ORalicaud mole frach'on of onah'c au'd first case = no of mMo er of oxal'c au'd Luate dotal mo) O.OSS 6 0.14133 o. 3318 mol O.OSS6 Case O. OSS6 oxalc aud.and 001337 o. OSS6+ 0«TO 22 oxal'c awd, 2"" caje 0. 04 60 aud 4 oxal'c Cas o. 02804 Or 0SS6.9Q72

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