Vinegar Titration Lab Procedure: 1.) Obtain ~100 mL of NaOH. Record the molarity on the data table. 2.) Set up a ring stand with a buret. 3.) Place 5mL of vinegar in a 125 mL Erlenmeyer flask. Dilute the vinegar with 25 mL of water and add two drops of phenolphthalein. 4.) Fill the buret with NaOH. Record the initial volume of the buret in your data table. 5.) Titrate the vinegar sample until the first faint pink color does not disappear. 6.) Record the final volume of the buret in your data
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“Dreams of the Animals” by Margaret Atwood represents the nature of animals’ dreams. They mostly dream of other animals “each according to its kind”‚ moles dream of “mole smells”‚ and frogs dream of “green and golden/ frogs”. The word “mostly” is used here. Why? That’s because there are exceptions. The poem later states that “certain mice and small rodents/ have nightmares of a huge pink/ shape with five claws descending”. The word “nightmare” doesn’t only mean a bad dream when sleeping‚ but also
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Table 1 to calculate the temperature at which a solution of 50 grams of sucrose (C12H22O11) in 400 grams of water will freeze. The molecular weight of sucrose is 12(12.01) + 22(1.01) + 11(16.00) = 342.34 g/mole so‚ the number of moles of sucrose is and the concentration of the solution in moles per kilogram of water is By taking the freezing point constant for water as 1.86 from Table and then substituting the values into the equation for freezing point depression‚ you obtain the change in freezing
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Na2SO4 D. NaCl‚ Na2S‚ Na2SO4 E. NaCl‚ Na2SO4‚ Na2S 25. The following unbalanced equation represents a reaction that occurs in basic solution: MnO41– + C2O42– → MnO2 + CO32– How many moles of MnO41– are required to produce 1 mole of CO32–? A. 4 B. 3 C. 2 D. 0.67 E. 0.33 26. Given reaction 2NH3(g) + 3Cl2(g) → N2(g) + 6HCl(g)‚ you react 5.0 L of NH3 with 5.0 L of Cl2 measured at the same conditions
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different substances (HCl and NH4OH) were inserted into the two ends of the glass tube. The substance with the lighter molecular weight value (NH 4OH‚ M = 35.0459 g/mole) diffused at a faster rate (dAve = 25.8cm)‚ resulting in the formation of a white ring around the glass closer to the side of the heavier substance (HCl‚ M = 36.4611 g/mole; dAve = 10.8 cm). The agar-water gel set up was composed of a petri dish of agar-water gel containing three wells. Drops of potassium permanganate (KMnO4)‚ potassium
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Theoretical Yield 4. Actual Yield 5. Percent Yield 6. Excess Reagent 7. Limiting Reagent 8. Law of Conservation of Matter Short Answer – explain the following: 9. What is conserved in every balanced equation (multiple answers)? 10. What determines the mole ratio in a balanced equation? 11. What is the proper method to determine limiting reagents? 12. What is the relationship between the masses of products and reactants? Practice problems: 13. Using the following equation: Fe2O3 + 3CO 3CO2 +
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I came to Lusher in the 8th grade. That was when I first heard that moles were an unattractive quality. I was in art class quietly painting with my soft-bristled brush coated in liquid red when I overheard a classmate ask their friend what they found attractive in girls. The brown-haired boy first listed what he found attractive in girls‚ such as a nice smile‚ clear skin‚ and large assets. Although after he listed the appealing aspects of what he associated with girls‚ he listed the “beastly” qualities
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of equation is equally balanced. The calculation for formula mass helps determine if you need to convert grams to a particular substance to moles‚ from a product. Moles are numbers that are in front of formulae. E.g.‚ 6NaCl‚ 6 is the equation for this formula. A mole would help you balance a skeleton equation‚ and also allows you to calculate how many moles are needed to take part in a chemical reaction. In the laboratory experiment‚ we are investigate the following equation and how they react:
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shows the six points of attachment in red and green. Ca 2+ + EDTA 4- ® CaEDTA 2- This equation shows that the EDTA reacts with the metal ion‚ which in this case is calcium on a 1:1 ratio‚ therefore it can be worked out however many moles of EDTA is used the calcium will be the same. To work this
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Final Exam Review Chapter 2 Study Questions 1. Define the following a) element b) compound c) pure substance 2. Classify each of the following as a pure substance or a mixture. For each pure substance‚ indicate whether it is an element or a compound. Which of the mixtures are solutions a) air b) titanium c) oak d) baking soda e) oxygen f) 7-Up g) wine h) carbon monoxide 3. Label each of the following drawings as element‚ compound‚ or mixture (Assume each type of circle
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