Molar mass

Nguyen Chem 1212L – 165 Feb 08 , 2014 Purpose and Procedure: The purpose of this experiment is using Compleximetric titration and EDTA to determine the concentration of Mg2+ in solution; and also calculating the percent by mass of MgO in the unknown sample. This procedure results no significant deviations. The procedure for the experiment is from the lab manual referenced below Laboratory Experiments for Chem 1211L & 1212L (6e), with Contributions from Georgia Perimeter

the mass of potatoes cut into equal sizes then soak these potato slices in different morality of NaCl for thirty minutes and measure the mass change in each potato slice. Materials • Potato (four slices) • Knife • Beaker (4) • Salt Solution .2, .4, .6 mol • Distilled water • Food Scale • Paper Towels Methods First I gather all my materials needed for the experiment (see materials list). Second I peel and slice potatoes weigh each potato in grams. Get these slices to weigh the same in mass because

Chemistry 1 by OCR as my reference. Relative Atomic Mass: This is the mass of an atom of the element relative to the mass of an atom of carbon-12 which has a mass of exactly 12. Relative Molecular Mass: This is the mass of a molecule of a compound relative to an atom of carbon-12. Mole: This is the unit of an atom of

Table 1: Masses of Sterling Silver Trial of Independent Variable Initial Mass (g)  0.01 Final Mass (g)  0.01 0.10 M Trial #1 1.00 0.99 0.10 M Trial #2 2.45 2.44 0.10 M Trial #3 2.27 2.26 0.50 M Trial #1 0.94 0.93 0.50 M Trial #2 1.34 1.30 0.50 M Trial #3 1.00 0.99 1.0 M Trial #1 5.98 5.96 1.0 M Trial #2 0.94 0.93 1.0 M Trial #3 5.22 5.20 1.5 M Trial #1 4.30 4.28 1.5 M Trial #2 0.95 0.94 1.5 M Trial #3 9.16 9.14 2.0 M Trial #1 3.27 3.08 2.0 M Trial #2 2.20 2.18 2.0 M Trial #3 1.77 1.75   Table

plugging this data into excel and making a chart and treating the chart as a function we can get the slope which in this case is the molar absorptivity which is part of the Beer’s law. Following, placing the Gatorade sample into a cuvet and place it in the spectrometer and look for the wavelength that was recorded in the stock dye samples Finally with the Molar absorptivity and the absorption of the Gatorade sample we can get the concentration of the dye in the sample and then we can get the

INTRODUCTION: The purpose of this two-part experiment was to “determine the mass percent of sodium hypochlorite in a commercial chlorine bleach sample” (lab website). Titration is used in this lab twice. In Part one, students will use the solution of KIO3 primary standard and use this solution to standardize a solution containing sodium thiosulfate. When the KI is added to the solution, it forms a brown/yellow color. Then students used titration to add Na2SO3 to make the color go from brown/yellow

Bromothymol blue is an acid-base color indicator. The acidic form of bromothymol blue is yellow. The basic form of bromothymol blue is blue. Therefore, a color change indicates that either a proton has become lost or gained by the bromothymol blue. This color change can be associated with the end point of a titration allowing the pKa to be calculated, as pKa will be equal to pH. The absorbance values of bromothymol blue at different pH values were recorded using a UV-Vis Spectrophotometer from 340-800

strontium can replace small amounts of the calcium in our bodies (Bentley 2006; Chenery et al. 2011; Ezzo 1994; Jorgenson et al. 2009; Price et al. 1994). While only a minute amount of the strontium is kept in our bodies, due to its relatively small mass differences between the

difference I’m tempature it could spark a new way to do things in this economic system we have. Footnote – substance Is the molecular weight in grams. Molar Mass is basically in grams per mole for example salt has a molar mass of 5.8g per mole. The mass of an element refers to 6.0221415x1023 molecules of the substance. Molar Mass helps us figure out how many grams per mole we need to do this project and it helps us know how much we need to put into the solution. If you don’t Find

which are coloured, absorb the light depending on how concentrated it is and this produces an electronic reading from the photometer which is the absorbance value. The maximum absorption was found for both solutions and was used to calculate the molar extinction coefficient of methylene blue. An unknown concentration of methylene blue was calculated by using