A. 0.420 M B. 0.567 M C. 0.042 M D. 0.325 M _____ 3. What is the freezing point of an aqueous glucose solution that has 25.0 g of glucose, C6H12O6, per 100.0 g of H2O ? (Kf for water = 1.86 °C /m) A.
What volume of 2.0 M hydrochloric acid is needed to completely react with the amount of calcium carbonate in Part 2a above? c. Based on Parts 2a and 2b above, how many moles of water would be produced? 3. Ammonium chloride and calcium hydroxide react according to the following balanced equation: 2 NH4Cl(aq) + Ca(OH)2(aq) ⋄ CaCl2(aq) + 2 NH3(g) + 2 H2O(l) a. What mass of ammonium chloride is needed to make 3.0 liters of a 1.5 M ammonium chloride solution?
From your three trials, calculate the average volume of Na2S2O3 needed for the titration of 25.00mL of diluted bleach. 3. Use the average volume and the molarity of Na2S2O3 to determine the molarity of the diluted bleach. (Find moles of Na2S2O3, convert to moles of NaClO, and divide by volume of dilute bleach that was titrated in each trial to get M). 4.
from the penny. * Dry the penny and retest x4 * Determine the number of drops of Chocolate milk it takes to fill a penny, holding the eye dropped 2 cm. from the penny. * Dry the penny and retest x4. * Calculate data.
For this lab, the density of water will be 1 gram/cubic centimeter. The mass of a certain substance is the amount of matter it contains. The volume of a certain substance is the amount of space the matter takes up. The density of a solution will depend on the solute, and the concentration of the solution. The concentration of a solution is the amount of solute that is dissolved into each unit of solvent.
3 96 119 92 111 70 57 50 74 59 58 average 113 99 69 59 55 Laboratory Report/ Cari Merritt/ Blood Glucose Regulation/ Dr. McClay/ 12.03.2014/ Page [1] of [4] Glucose Concentration in Blood Plasma Ketone Concentration in Blood Plasma 1. When was plasma glucose concentration highest? If values are similar for several time points (within a few points of each other), then give range of times when plasma glucose concentration was highest. Plasma glucose was highest right after the meal and 1 hour after the meal. 2.
101 g Fe c. How many moles of Fe2O3 will react with 99.0 g of Al? ans. 1.83 mol Fe2O3 3. The reaction N2(g) + 3H2(g) ( 2NH3(g) is used to produce ammonia commercially. If 1.40 g of N2 are used in the reaction, how many grams of H2 will be needed?
6. How many moles of NaCl are in 250. mL of a 0.200 M solution? 1. 15.8 g of KCl is dissolved in 225 mL of water. Calculate the molarity.
Investigating the Chemical Composition of Alka Selzter Problem: How much sodium bicarbonate is in a tablet of Alka Seltzer? Purpose: To discover the amount of sodium bicarbonate, in grams, in a one tablet of Alka Seltzer. Materials: one Alka Seltzer tablet 50 mL of vinegar post-it note Triple beam balance beaker Procedure: 1) Put the post-it on the triple beam balance and zero the balance. 2) Measure the masses of the alka-seltzer tablet, and the beaker + vinegar. Record them.
Procedure: Refer to Chemistry Lab Manual pp. 33-35, 37. Results: The density of the yeast-sugar solution on day 1 was 1.05g/mL. On day 2, the density of the solution had dropped down to 1.00g/mL. We found the mass of our pure alcohol to be 10.23g.