Chemistry 101 Lab 7 Determination of % NaHCO3 in Alka Seltzer Tablets Names ____________________________and ___________________________ Date ____________________________ Objectives: (1) To determine the amount of NaHCO3 in Alka Seltzer tablets by observing the amount of CO2 produced from the acid-base reaction of HCO3- with acetic acid (in vinegar). (2) To study the concept of limiting reactant. Background: Alka Seltzer is an effervescent tablet that contains aspirin
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concentration of NaHCO3 solution increases‚ as will the rate of photosynthesis until optimal levels are reached‚ then plateauing of results will occur. The hypothesis was refuted by evidence shown in the results (table two) as 0.5% concentration produced the greatest rate of photosynthesis‚ 3.10x10-3. Concentrations of 5% and 10% were deemed unusable as the agapanthus discs would not submerge‚ therefore the results did not enable a range of data. The results of the data indicate that 0.5% NaHCO3 is optimal
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the addition of NaHCO3 (sodium bicarbonate) to the water may affect the osmotic ability of the water. Just 2g of sodium bicarbonate in 1000ml of water gives the equivalent salinity of seawater‚ and as Elodea is a fresh water plant‚ it cannot survive in salt water. I will need to take this into account when measuring the NaHCO3. To work out the rate of photosynthesis I am going to count how many bubbles of O2 are given off in a minute. Prediction I think that the more NaHCO3 there is in the
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Carbonate Aim: When Sodium Hydrogen Carbonate (NaHCO3) is heated‚ Carbon dioxide and water are given off to leave a white powder. The aim is to find the equations for this reaction. Hypothesis: The experiment will prove which of the equations below is true. It will tell us whether Sodium Carbonate is produced or Sodium Oxide. 2NaHCO3 Na2CO3 + CO2 + H2O 2NaHCO3 Na2O + 2CO2 + H2O Variables: Independent: Original Mass of NaHCO3 Dependant: Final Mass of the Residue
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approximately .0821 L x atm./K x mol. To verify Avogadro’s gas constant R this experiment combined various amounts of NaHCO3 (limiting reagent) with excess CH3COOH to produce various volumes of CO2 gas. By using NaHCO3 as the limiting reagent‚ the experiment was able to conduct multiple trials with varying amounts of NaHCO3 to best test Avogadro’s theory. NaHCO3(s) + CH3COOH(aq) → NaCH3COO(aq) + CO2(g) + H2O(l) (4) By plotting this data in a graph and deriving the best-fit
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Chemistry 1: PROBLEM SET SY 2012/2013 CLASS #: _______________ NAME_________________________________________ SECTION: ______________________ Stoichiometry II - Mole Calculations/ Limiting and Excess Reagent – Lecture Notes 1. Given the balanced equation N2(g) + 3H2(g) 2NH3(g) How many moles of ammonia are produced when 0.60 mol of nitrogen reacts with hydrogen? 2. Given the equation: SiO2 + HF SiF4 + H2O a. Calculate the number of moles HF that would completely react with 2.5 moles of
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Let’s Make Salt Purpose: Could NaCl be made using NaHCO3‚ hydrochloric acid‚ and a boiling chip? Hypothesis: If I combined NaHCO3‚ hydrochloric acid‚ and a boiling chip I think it will form NaCl because when you balance the equation it makes a new chemical reaction. Materials needed: test tube cleaner‚ test tube‚ test tube tongs‚ hot plate‚ a scale‚ graduated cylinder‚ water‚ goggles‚ fire retardant glove‚ beaker‚ test tube holder‚ a scoopula‚ hydrochloric acid‚ sodium bicarbonate‚ soap‚ pipette
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Topic 10 Rate of Reaction Part A Unit-based exercise Unit 36 An introduction to rate of reaction Fill in the blanks 1 concentration; time 2 instantaneous 3 a) the gaseous product / carbon dioxide evolved b) loss in mass 4 a) colorimeter b) standard alkali c) the gaseous product / carbon dioxide evolved 1 time to reach the opaque stage 5 transmittance; 6 hydroxide; titrimetric True or false 7 T In the oxidation of methanoic acid by bromine‚ the intensity of the orange colour of bromine
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I. Introduction The Percent Yield lab is designed to further the students’ understanding of percent yield by having them predict how much material will be produced from a reaction; specifically a double replacement reaction. In order to perform the lab‚ a solid understanding of percent yield is necessary. According to Prentice Hall Chemistry book‚ percent yield is comprised of two main components. The first is the theoretical yield. The theoretical yield is what is calculated and predicted. It is
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acidosis‚ on the basis of individual case reports. The risk appears to be considerably less than with phenformin and involves patients with underlying severe renal and cardiac dysfunction. Drugs used to treat lactic acidosis can aggravate the condition. NaHCO3 increases lactate
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