Determine if a homogeneous solution forms when each pair of substances is mixed. Check all that apply. O CH3 CH2 CH2CH2CH3 and CH3 CH2 CH2CH2CH2CH3 O CBr4 and H2O O Cl2 and H2 0 Submit Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remaining You have identified at least one incorrect pair of substances. Classify each compound as pola that "like dissolves like." For example, polar compounds dissolve homogeneously with other p
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- Why is potassium hydrogen phthalate (KHP) used to standardize the NaOH solution instead of measuring out a known mass of solid NaOH to be dissolved in water? KHP is an acid and will neutralize some of the NaOH to use later. O There is no reason, NaOH solutions can be used without standardization. O Solid NaOH is hygroscopic and will absorb water, making it virtually impossible to determine a true initial mass and therefore changing the concentration of the solution. Solid NaOH evaporates therefore its concentration can never be known.2. Make the following solution isotonic with respect to membrane. Provided that you have isotonic diluting solution, calculate the volume in mL of isotonic solution that may be prepared by mixing drug with water. Rx Phenacaine (E = 0.20) 0.06 g Sterile water, ad 100 mL Sig. make isotonic solution INSTRUCTIONS: Justify your answer through calculations which contains; GIVEN FORMULA USED SUBSTITUTION CALCULATED VALUE FINAL ANSWER102 Experiment 12 Determination of Molar Mass by the Freezing Point Depression Method 2. The equation ATf Kem is only strictly applicable to very solutions. 3. The f.p. lowering (AT) only depends on the molality and is independent of the nature of the solute. This is known as a - property. 4. A solid is melted then allowed to cool and the temperature of the liquid is recorded every 2 minutes. According to the plot below, the most probable f.p. of the solid is. °C. Temperature (°C) 75.5 75.0 74.5 74.0 73.5 73.0 72.5 72.0 71.5 71.0 70.5 0 2 4 6 8 10 12 14 Time (min) 16 18 20 22 24 26 (Figure created by David Sarno.
- 102 Experiment 12 Determination of Molar Mass by the Freezing Point Depression Method 2. The equation ATf = Kfm is only strictly applicable to very solutions. 3. The f.p. lowering (AT;) only depends on the molality and is independent of the nature of the solute. This is known as a property. 4. A solid is melted then allowed to cool and the temperature of the liquid is recorded every 2 minutes. According to the plot below, the most probable f.p. of the solid is °C. 75.5 75.0 74.5 74.0 73.5 73.0 72.5 72.0 71.5 71.0 70.5 4 6. 10 12 14 16 18 20 22 24 26 Time (min) Temperature (°C) (Figure created by David Sarno.) р. 102A. Standardlzatlon of thlosulfate solutlon Trial 1 Trial 2 Trial 3 Initial volume of thiosulfate (mL) 0.00 20.05 2.3 Final volume of thiosulfate (mL) 20.05 40.05 22.15 Volume of thiosulfate used (mL) Molarity of thiosulfate Average Molarity of thiosulfate Calculate the molarity of the thiosulfate solution using the formula: 6 mmol S20,²- 1 mmol 10, Ms,0,2- 0.004167 M 10,- 20.00 ml Vol S20,²- used (mL)The freezing temperature of the benzoic acid-lauric acid solution can be determined by finding the temperature at which the mixture initially started to freeze. Unlike pure lauric acid, the mixture results in a during freezing. --in temperature O gradual linear decrease very sharp nonlinear decrease gradual linear increase gradual non linear increase None of them
- -Lab. II. Freezing point of a pure solid. Data Table. mass of pure naphthaleneo il1.3119 * 2. Freezing (melting ) point of naphthalene10.4 III. Molecular weight by freezing point depression. dEISI Data Table 1. mass of unknown * 2. Freezing (melting ) point of solution 72.3°0 Calculation (Carry out to proper number of significant digits.) 1. AT (difference in freezing points of pure naphthalene and solution) AT= oN awominU 2. molecular weight of unknown solute AT=Kfgmi KP Naph =7.0°Gt molal 7.0°%/molalCryoscopic Determination of Molecular Weight Post-Lab Questions (40 Points) Name Lab Instructor 1. A student performed a freezing point determination and calculated the molar mass of Lab Day Date an unknown like you did in this experiment. The only difference in procedure was that when determining the freezing point of the unknown-naphthalene mixture, they started with a clean empty test tube. If the following errors occurred, how would each affect the calculated molar mass of the solute (too high, too low, or no change)? Explain your answerS. A. The thermometer used actually read 2.0°C too low for all measurements The test tube was put flat on the lab bench and some naphthalene spilled out. The student did not reweigh the test tube, proceeded to determine both the freezing point of pure naphthalene and the freezing point of the unknown-naphthalene mixture. B. The student after weighing out 1.02 g of the unknown accidentally spilled a small amount onto the floor when pouring the…* 00 A solution is made by mixing equal masses of methanol, CH,O, and ethanol, C, H,O. Determine the mole fraction of each component to at least three significant figures. Xmeth X eth %3D Show all 10:02 PM 10/17/2021 PrtScr Insert Delete F10 F11 F12 F8 F5 Backspace 24 6. { R. Enter H J K Shift B. N Alt Ctrl Home PgDn End
- EXPERIMENT Determination of Molar Mass by the Freezing Point Depression Method 12 Prelaboratory Questions Name Laboratory Section Show your work, include units, and report the correct number of significant figures for all calculations. 1. The molal freezing point depression constant (K;) for p-dichlorobenzene is 7.10°C/m and its normal freezing point (f.p.) is 53.10°C.When 0.304 g of an unknown solute is dissolved in 3.78 g of p-dichlorobenzene, the f.p. is lowered to 49.60°C. Refer to the Introduction and Data Sheet to solve the following problems. a) The f.p. depression (ATf) is °C. b) Calculate the molality (m) of the solution. c) Calculate the number of moles of solute in the solution. d) Calculate the molar mass of the unknown solute. (continued on next page) 101 р. 101uminateed.com/assessment/605ae50d7d1746b707867566/60627 Clever Portal Student Portal - Ho... Dashboard - Memri... 6 New Tab A English I Loyai q_UE9 Open Response Questions - 10 and 11 A- HNO2 O H* NO2 O H' A student is asked to describe the characteristics of the two solutions above, which have the same molarity. A students makes the following statement, "Since both solutions have the same molarity, they will also have the same pH." Do you agree with the student? Justify your reasoning.What is the minimum distribution coefficient that permits removal of 99% of a solute from 50.0 mL of water with a two 50.0-mL extractions with toluene? Distribution coefficient = = b five 45.0-mL extractions with toluene? Distribution coefficient =