Determination of Water Hardness Using a Titrator Heather Crall Chemistry 1 SMT- 271044 10/17/2012 Abstract From seeing all of my results and conclusion I now see that I didn’t understand this lab very well and that its not easy when others try to help. Since I have hard water it tells me that my water flows over and through rocks and minerals‚ like limestone. Purpose The purpose of this lab is to become familiar with the concept of water hardness. We learn that hard water contains high
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transformation of the cultural type. Some old and more experienced people may claim that this kind of change is somewhat disrespectful to the convention‚ but the truth is a large number of cultures are formed by innovation. According to The Case for Contamination‚
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Seed Germination Lab Report Outline Due: FRIDAY‚ SEP. 28 Question: What question will your experiment answer? Research: Three reliable sources with authors and/or publisher and date last updated. You cannot use Wikipedia. Please print out all internet sources with highlighted information you will put in your own words in your introduction. ***Staple your research to this paper!!!!!! Hypothesis: *Must be testable. *Must make a prediction that addresses your question. *Must
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PRE-LAB QUESTIONS: 1) What cations are responsible for water hardness? Ca2+ and Mg2+ are responsible for water hardness 2) Calculate the mass of disodium Ethylenediaminetetraacetate required to prepare 250 mL of a 0.010 M solution. Mass = M x L x MM 0.010 M x 0.250 L x 372.24 g/mol = 0.93g of Na2H2Y 3) What is the molar concentration of the Na2H2Y solution? mol Ca = M x L 0.0107 M x 0.025 L = 2.65 x 10-4 mol if 1 mol of Ca = 1 mol Na2H2Y then: M of Na2H2Y = mol / L 2
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Soil contamination Soil contamination or soil pollution is caused by the presence of xenobiotic (human-made) chemicals or other alteration in the natural soil environment. It is typically caused by industrial activity‚ agricultural chemicals‚ or improper disposal of waste. The most common chemicals involved are petroleum hydrocarbons‚ polynuclear aromatic hydrocarbons (such as naphthalene and benzo(a)pyrene)‚ solvents‚ pesticides‚ lead‚ and other heavy metals. Contamination is correlated with the
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continue to escalate. Cross-contamination is a concern because the spread of microorganism from room to room can rapidly become a big outbreak. Understanding the modes of prevention is vital for the success against bacteria; these responsibilities apply to everybody working and visiting a hospital. Using a good hand washing techniques‚ proper wear of personal protective equipment and sterilization of surgical equipments are the first line of defense in preventing cross-contamination in a hospital setting
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Diffusion Lab Research Question: How does the amount of water in a beaker affect the rate at which food coloring diffuses to the bottom of the beaker? Independent Variable: Height of water in beaker (Inches) Dependent Variable: Rate of diffusion (seconds) Controlled Variables: * Size of beaker * Temperature of water (23°C) * Type/color of food coloring * Person Timing * Environmental conditions Materials: * Beaker(well over 4 in tall) * Food coloring * Tap water(23°C)
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Percent Water in a Hydrate PURPOSE To determine the percent water in a hydrate sample. INTRODUCTION Many substances contain water molecules as a part of their crystal structure. We call such solids hydrates‚ and we call the bound water the water of hydration. A hydrate has a definite number of water molecules bound to each anhydrous salt unit. The formula of the hydrate copper(II) sulfate pentahydrate is CuSO4 · 5 H2O The dot indicates that the molecules of water are attached to the ions in
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SHC of water • To see how accurately I can measure a known quantity Research Question • Will the experiment carried out give us a good approximation of the SHC of water? Hypothesis • The result we will get as the SHC of water will not be exactly the same as the literature value‚ but will be a very close figure to the literature value of the SHC of water as there will be some limitations to our experiment. Variables Independent: temperature of water Dependent: SHC of water Controlled:
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The water quality of the U-high creek was excellent. However‚ not all water has excellent water quality. There are many ways water can become polluted. Humans play a key role in the pollution of water because water is an easy way to dispose of waste.( Lentech‚ 2016) For example‚ farmers use fertilizers to help their crops grow‚ but when it rains the rainwater takes the chemicals used in fertilizers and transports it into the bodies of water. These fertilizers contain nitrate and phosphate.
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