ipl-logo

Molar Mass Lab Report

738 Words3 Pages

Conclusion: Every compound has a uniquely identifying molar mass as well as individual properties. In this lab, the purpose was to use the properties that three unknown alkali metal carbonate powers have, to identify the molar mass. For the three unknown substances, they all were white powders of about the same texture, and they all reacted when added to hydrochloric acid. Based on these properties, it is impossible to distinguish which one is which due to the similarities, so it is necessary to solve for the molar mass since that is unique to every element and compound. In this lab, 30 mL of hydrochloric acid are reacted with the limiting reactant that is the unknown powder, either A, B, or C.The amount of acid is negligible due to it not …show more content…

After the reaction finishes, the amount of CO2 that was released is calculated and then using the molemap, it is possible to solve for the amount of the unknown substance. The grams of the unknown powder are then divided by the moles of the substance to get the molar mass. This molar mass is then compared to the molar mass of the known substances. Unknown substance A is lithium carbonate since the molar mass produced in the experiment is 66.68 g/mol and the molar mass of lithium carbonate is 73.89 g/mol. Unknown substance B has a molar mass of 146.70 g/mol which is inconclusive since it is too different from the other molar masses. Unknown substance C is sodium carbonate since the molar mass found in the experiment is 110.03 g/mol which is close to the actual molar mass of sodium carbonate that is 105.99 g/mol. Substance A is lithium carbonate since the lab produced 0.33g of CO2 which can be used to calculate the moles of the unknown substance. Since the moles of the unknown are 0.007498 mol, we can divide the original mass used in the experiment (0.50g) by this to get 66.68 g/mol as the molar mass. This then is relatively close to the molar mass of lithium carbonate which is 73.89

Show More
Related
1800 Words | 8 Pages

Purpose: The purpose of this lab is to titrate an unknown solid acid (KH2PO4) with a standardized sodium hydroxide solution. After recording and plotting the data, the acid’s equivalence point will be recorded once the color changes. Using the equivalence point, the halfway point will be calculated, which is used to determine the acid’s equilibrium constant. The acid’s calculated equilibrium constant will be compared with the acid’s established pKa value.

Read More
444 Words | 2 Pages

The purpose of the lab is to acquire the percent composition of zinc and copper. The procedure included obtaining a post 1983 penny and washing it with soap and water. Using a triangular file, we made an X on the penny. Then, we cleaned the top and bottom of the penny with steel wool until it was shiny. We rinsed the penny in acetone and dried it with paper towel.

Read More
1513 Words | 7 Pages

Qualitative Data: Prior to combining the solution CuCl2 was a transparent blue and Na2CO3 was clear While combining the solutions CuCl2 and Na2CO3, the solution became a cloudy blue After filtering the a dry blue powder was left inside the filter paper and a clear solution had drained through the paper filter. Calculations: Molar Mass and Number of Moles of Reactants CuCl2 and Na2CO3 Molar Mass of CuCl2 = 63.55 g Cu + (2 35.45g Cl) Molar Mass of CuCl2 = 134.45g CuCl2 Molar Mass of Na2CO3 = (2 22.99g Na) + (3 16.00g O) + 12.01g C Molar Mass of Na2CO3 = 105.99g Na2CO3 Moles of CuCl2 = Mass of CuC =

Read More
787 Words | 4 Pages

Which was 117.60 grams for substance 1, 87.71 grams for substance 2, 54.7 grams for substance 3, 25.11 grams for substance 4. Once we finished weighing each unknown substance we started figuring out the g/mol mass of each compound that the substances could possibly be, which is how we got to Table #2 above. In order to find the g/mol mass of each of the compounds, we had to find the molar mass of each element, then multiply and add accordingly. I'll use K2SO4 as an example of how to calculate the molar mass of a compound. The elements in K2SO4 are Potassium, Sulfur, and Oxygen.

Read More
1222 Words | 5 Pages

Introduction The purpose of this Lab was to identify the density of the unidentified object and determine what substance the unidentified object given by the teacher was. The density calculated in the experiment will stay the same because the density of the unidentified object will stay constant. The Independent Variable of this experiment was the calculated density and the unidentified object given. The Dependant Variable for this experiment was the density.

Read More
669 Words | 3 Pages

The topic that the scientist has researched is the reaction rate of different particle sizes. In the experiment, the scientist will discover how the particle size of Alka Seltzer affects the rate of chemical reaction with water. The independent variable in the experiment is the particle size of the Alka Seltzer, while the dependent variable is the rate of reaction, or the volume of Carbon dioxide. The volume of carbon dioxide will be measured in ml. Also, a few of the constants in the experiment will be the amount of water, and amount of tablets.

Read More
416 Words | 2 Pages

The mass we measured after the whole process came up, was 121.80g. The chemical reaction happened between the water and the tablet conserves the mass of the water. As a whole point, we claimed that there was a chemical reaction between the water and the tablet that produced carbon dioxide and the mass remained as same as before and after the

Read More
646 Words | 3 Pages

Use the evidence provided by the tests to identify the mystery powder. The mystery powder (#5) is the baking powder. My partners and I figured this out because the physical and chemical properties of both of the substances are very similar. For example, both powders are not soluble in water, and they both turned red when they reacted with the universal indicator.

Read More
310 Words | 2 Pages

Introduction : The percent composition of a compound can be found by determining the mass of each element within that compound, and with this information, the empirical formula can be determined. The lab consisted of obtaining a magnesium ribbon and having it undergo chemical reactions to create solid magnesium oxide with the aim being identifying the percent composition and empirical formula of the compound. Background Information : To determine magnesium oxide’s percent composition and empirical formula, the masses of magnesium and oxygen separately must be found and then divided by the total mass and multiplied by 100 to find the percent makeup of each element within the compound. However, to obtain magnesium oxide, it had been synthesized from magnesium and various chemical reactions with only the initial mass of magnesium and the final compound’s mass being known.

Read More
729 Words | 3 Pages

Using the Law of Definite Proportions, the mass of this product was used to determine the number of moles of copper and chlorine in the sample, which led to being able to determine the

Read More
499 Words | 2 Pages

.1-amEr (c) Gram molecular mass of HNO3 = Mass of 1-molecule of HNO3x NA = 63 amu x NA = 63 gm X NA = 63 gram NA Solved Example-4:Find out the mass of carbon -12 that would contain 1.0 x1019carbon-12 atoms. Solution : Mass of 6.022 x1023 carbon-12 atoms = 12 g Mass of 1.0 x1019 carbon-12 atoms = 12x1x10 19 g 6.022 x1023 = 1.99 x10-4g Solved Example-5: How many molecules are present in 100 g sample of NH3?

Read More
1146 Words | 5 Pages

Experiment 9: The Molar Volume of a Gas Introduction Description: The purpose of this experiment was to determine the molar volume of a gas by conducting the hydrogen gas producing chemical reaction: Mg(s)+2HCl (aq)→〖MgCl〗_2 (aq)+H_2 (g) A known mass of solid magnesium was reacted with an excess of hydrochloric acid in a sealed vessel, three times, for a total of three trials.

Read More
949 Words | 4 Pages

Molar mass is the mass in grams in one mole of substance. The units for molar mass are in grams per mole. Molar mass is the same number as the formula mass that needs to be found except it is converted. Formula mass is the mass in atomic mass unit of one particle of

Read More
372 Words | 2 Pages

I. Purpose: To experimentally determine the mass and the mole content of a measured sample. II. Materials: The materials used in this experiment a 50-mL beaker, 12 samples, a balance and paper towels. III.

Read More
1398 Words | 6 Pages

AIM To design an investigation to study the kinetics of a reaction of your choice RESEARCH QUESTION With respect to hydrochloric acid (HCl), what is the order of reaction in the reaction between HCl and calcium carbonate (CaCO3) determined by changing the concentration of HCl and measuring the volume of carbon dioxide gas (CO2) collected in 30 seconds whilst keeping the mass of the powdered CaCO3 constant and the temperature of the reaction system at 25oC? BACKGROUND INFORMATION Calcium carbonate (CaCO3) is a chemical compound that is commonly found in rocks such as chalk, limestone, marble and travertine in all parts of the world. It also used as a form of medicine as a dietary supplement for a person with insufficient calcium intake because calcium is needed by the body for healthy bones, muscles, nervous system, and heart. CaCO3 is also used as an antacid to relieve

Read More

More about Molar Mass Lab Report

Open Document