0.05mol/6M=8.3*10-3 L=8.3mL stock solution c. 100mL-8.3mL=91.7mLwater Add 91.7 water to 6M stock solution to prepare 0.5M acetic acid. Exercise 8: a. 42.35 - 0.55 = 41.8 mL b. The moles of EDTA4- : 0.0189M*(41.8*10-3)L=7.9*10-4mol c. Zn2+(aq)+EDTA4-(aq)—Zn(EDTA)2-(aq) The ratio Zn2+ and EDTA4- is 1:1 The moles of Zn2+= the moles of EDTA4-=7.9*10-4mol d. 7.9*10-4mol*65.39g/mol=0.0517g Zn e.
White precipitate shows the presence of chloride (Cl-). Chloride anion equation: HCl(aq) + AgNO3 (aq) → HNO3 (aq) + AgCl(s). The nitrate anion test involves cooling a mixture containing 1 mL of test solution and 3mL 18M H2SO4. 2mL is poured down the inner test tube side and the presence of a brown ring shows nitrate (NO3-) to be present. The carbonate anion test mixes 1 mL of test solution and drops of 6M HCl.
A) Subscripts in the reactants must be conserved in the products. B) Coefficients are used to balance the atoms on both sides. C) The law of conservation of matter must be followed. D) Phases are often shown for each compound but are not critical to balancing an equation. E) All of the above statements (a-d) are true.
Module 3: Natural Forces Affecting the Driver Vocabulary: Please define six (6) of the following terms in your own words. Please do not just copy and paste the definition. 1. Gravity - The force that attracts a body toward the center of the earth, or toward any other physical body having mass. For most purposes Newton's laws of gravity apply, with minor modifications to take the general theory of relativity into account.
| Observations of Chemicals | Zinc Sulfate | Powder of a white solid | Barium Iodide | Powder of a white solid. | Deionized water | Liquid, transparent. | Trial # | BaI2 | ZnSO4 | Theoretical Yield of ZnI2 | Actual Yield | Percent Yield | 1 | .67g | .45g | .499820g | .52g | 104% | 2 | .67g | .45g | .499820g | .52g | 104% | 3 | .66g | .46g | .493117g | .48g | 97% | Calculations for Cost | Double Replacement | Synthesis | 0.48 grams of Zinc Sulfate - $0.02 | 1.00 gram Granular Zinc - $62.50 | 0.67grams of Barium Iodine Dihydrate - $0.886 | 2.00 gram Iodine - ($74.90 × 2) - $149.80 | 0.52 grams of Zinc Iodide - $0.906 | 1.00 gram zinc - $0.212 | 1000 grams of Zinc Iodide = $1,923.00 | 1000 grams of Zinc Ioidide = $212.30 | Focus Question Should chemists prepare Zinc Iodide, from its Elements or from a Double Replacement Reaction between Barium Iodide and Zinc Sulfate?
Therefore the alkalinity of water samples is being calculated. In the second approach, the two volume readings for the respective amounts of sulfuric acid used are being determined an indicator based method. Congo red and bromocresol green are being used as the indicators. Procedure (Outline provided as pre-lab): A. The pH meter was calibrated using standard pH solutions provided.
Liquid-liquid extraction Informal report By: Afi Ahmed 100959296 Presented to: Devien Durbano CHM2203 May 26th 2014 Results and calculations Table 1: Mass of mixture containing benzoic acid, 2-naphthol, and hydroquinone dimethyl ether and recrystallization. Mass of mixture: 3.03g Compound | Original mass | Recrystallized mass | Benzoic Acid | 1.01 | 0.14 | 2-naphtol | 1.01 | 0.43 | Hydro. Dimethyl ether | 1.01 | 0.16 | With these values we are able to calculate the percent recovery for Benzoic acid, 2-napthol and the hydroquinone dimethyl ether. 1) Percent recovery for isolation of benzoic acid % Recovery = mass of recovered material _________________________________ x100% mass of starting material = (0.14/1.01) x100% = 13.86% That concludes that the percent recovery is 13.86%. 2) Percent recovery for isolation of benzoic acid % Recovery = mass of recovered material _________________________________ x100% mass of starting material = (0.43/1.01) x100% = 42.57% That concludes that the percent recovery is 42,57%.
Write True or False : 1. If the amount of large and fine particles is about the same, then the soil is called loamy soil. 2. The layer which is hard and difficult to dig with spade is called top soil. 3.
Purpose: Critical thinking Terms 1. Law: a rule of nature that can never change 2. Theory: an explanation based on many observations that can change 3. Mass: the amount of matter in an object-always in kg 4. Weight: force due to the gravity of an object-w=mg 5.
| | | | | | | | | | | | | | Question 25 | What is structural section of the city-standard driveway approach? | | | | | | | | | | | General (both drawings and specs) | | | Question 26 | What are the grading tolerances for the AC access trail subgrade? | | | | | | | | | | | | | | Question 27 | What is the engineer’s estimated quantity of excavation? Of embankment? | | | | | | | | | | | | | | Question 28 | What are the compaction requirements for “embankment” or “engineered fill”?