Question

Virtual Lab # 3 Concentration Name: Section Number: Date of Submission: Instructions: Please launch the simulation in the link below to help you answer the following questions. Link: https://phet.colorado.edu/sims/html/concentration/latest/concentration en.html Part 1: Concentration Calculations Using Molarity Formula - Procedure: For Trial 1: Fill up the tank to I 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 Qucestion 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 9 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 and record the exact concentration in your table. If the solution reaches saturation before you are able to reach this concentration, write the word "SATURATED" in the concentration column and mark through the to begin rest of that row on the Analysis Table- We will discuss saturation in Part 2, Click next trial 6. Repeat # 5 for the other solid solutes, each time use 0.1 L less water (one mark down) 0'a0 T00 MK0N /0 Part 1-Analysis: moles of solute Molarity 1. For the unsaturated trials only, use the molarity formula: to find the moles of solute added in each trial, fill in Analysis Table 1. Note -the unit for Molarity is mol/L, but is often called "Molar," abbreviated with a capital "M." Show work for Cobalt(I) volume of solution in liters Nitrate only below: mp pa Pmos a aqkey aopdsa spaada 1o spurs e am aap 'e aauy 2. For the unsaturatcd trials only, convert the mole of solute to grams for cach trial and fill in Analysis Table 1, Recall: 1 mol-Molar Massig). Show work for Ceobalh (11) Nitrate only below Part 1-Data&Analysis DATA TABLEI ANALVSS TAMLE Solute Meles of Selate (mol Grams of Salute (g) Chemical Formala Conceatraion of Sela (mo/ or M) Moler Mass (am Valeme of Water .b Drink mix UNKNOW UNKNOW UNKNOW ОМп N 1,00 N N Cobalt (I) nitrater 0.90 Cobalt chloride 0.80 Potassium dichromate 0.70 Potassium chromate 0.60 INickel () chiorider 0.50 Copper suifate 0.40 Potassium permanganate 0.30 . Without adding any new solute, did draining some solution dilute the solution? 2. Which solute required the most mass to reach the 2 mol/L concentration? Least mass? 3. Which solutes saturated before reaching a concentration of 2 mol/L? 4. As you completed the trials, why should it take less & less mass to reach the concentration of 2.0 Part 1-Questions: Explain using complete sentences. mol/L? endieeup priwoiot ertt ewans Bonleri of woted 2ni ent ni noitslumia ert ronusl eas919 enoitountent noizimdua to etsa 79dmuИ пойзsг

Answer 1

Date Cabatl Nidsate- 183 ¢ - 0.40L 2M 1.8 mmoles 329.4 9 Co el lobat Chloide 1304 080 L 2M 6 aeles 208 Potossium dicheamate B2,Oy1949 0.701 IN 4Males L4LI Potassium chemate -aL 1.2 moles 2131 (132 8) Nickelli)ehlede - ichy1309 'SOL 130g 1mole Ceppes sulfate CusDy -1609 LLOL 2M 0.2Male 128 Potossium pOgenate-KMay -030L .6 mole

1.no draining some solution doesn't make any change in concentration of solute as along with solution the solute particles are also drained. Keeping the concentration same.

2.most mass.- potaaapot dichromate

Least mass - potassium permanganate

3. Potassium dichromate saturates before making a solution of 2 mol/ litre.

4.as the volume of solution decreases as we proceed with the trials the amount of substance needed to reach 2mol/litre also decreases. As the amount needed is relative to volume of solution.

The working formula is

Molarity = moles / volume(in litres)