Concentration Lab

Name Key 100 Date Period 0.000 Concentration Pre-Lab: use your textbook or google to define the following terms on paper & attach 1. Saturated 3. Solubility 5. Solute 7. Molarity 9. Molar 2. Supersaturated 4. Concentration 6. Solvent 8. Dilute 10. Insoluble Part 1: Concentration Calculations Using Molarity Formula - Procedure: 1. For Trial 1: Fill up the tank to 1 L, choose Solute: Drink Mix(solid), drag purple concentration meter into the tank as shown: 2. Shake the shaker to add solute to the water until you have an approx. concentration = 2 mol/L. Record the exact "Concentration of Soln" in Data Table 1. 3. Reduce the volume of water to approx. 0.50 L by draining half the tank. Without recording anything, notice any effect on the concentration and answer Question 1. 4. Click to begin next trial. 5. For Trial 2(etc), Choose Cobalt (II) Nitrate (solid) & record its chemical formula and molar mass in Data Table 1. Fill your tank to the 9th mark as shown. Note the tank's volume is graduated by 0.1 L marks, so the volumes are written to the hundredths decimal place. Again, add solute until your concentration is approx. 2.0 mol/L ar record the exact concentration in your table. If the solution reaches saturation before you are ab to reach this concentration, write the word "SATURATED" in the concentration column and mark L through the rest of that row on the Analysis Table - We will discuss saturation in Part 2. to begin next trial Click 6. Repeat #5 for the other solid solutes, each time use 0.1 L less water (one mark down) Part 1-Analysis: Molarity = moles of solute 1. For the unsaturated trials only, use the molarity formula: volume of solution in liters to find the moles of solute added in each trial, fill in Analysis Table 1. Note the unit for Molarit is mol/L, but is often called "Molar," abbreviated with a capital "M." Show work for Cobalt(II) Nitrate only below: Academic 3pts Honors: 2pts moles solute = (molarity) x (Volume of Soln') moles solute = (2,000m) x (0.9L) = 1.8mol may vary somewhat 2pts Ipteach = 1000S/L calculation of the slope of this line using: M: 1,000-0 1.0 УУ DATA TABLE 3 Part 3-Analysis: 1. Calculate the moles of solute required to saturate the solution using the molarity formula and record your result in Analysis Table 3. Only show work for 0.10 L solution below: mol = (molarity)x (Volume of Soln') mol = (5.640mo%) x (0.10L) = 2. Calculate the grams of solute required to saturate the solution using the molar mass and record your results in Analysis Table 3. Only show work for 0.10 L solution below: 0.56mol O.Slemol Co(NO3)2 182.95g Co(NOS). 2 = 102.45291.0x109 Ilmol Co(NO3) CO(NOS)2 3. On the Mass of Solute Vs. Volume of Solution, plot data points & make a line of best fit. Show ANALYSIS TABLE 3 (This result is called Mass/Volume %) Mass of Solute Vs. Volume of Solution Moles required to saturate solution (mol) Grams required to saturate solution (g) Concentration at Saturation Point (mol/L or M) Volume of Solution 10pts 1000 0.10 5.440 0.54 100 0.20 1.1.200 Mass (g) 11pts 0.30 1.7. 310 0.40 0.50 0.60 0.70 (1pt) 2.3. 420 500 2.8 520 3.4 620 3.9 710 0.80 4.5 $20 0.90 930 1.00 5.6 1000 ١٠٥ 0.5 Volume (L) 1/2 pteach Part 3-Questions: Explain Using Complete Sentences 1. The mass of a solute versus the volume of a solution is known as mass/volume percent. it is a unit for concentration (g/L x 100%) often used in medicine, particularly with IV bags. If the mass percent of the saline is 0.9%, how many grams of "salt" in a 1 L saline IV? Show Work: mass solute vol. soln mass/vol mass = (mass/vol%)x(Vol. Soln') mass = (0.0098/L) x (1L) = 0.009 g NaCl X 0.9% 0.009