



Study with the several resources on Docsity
Earn points by helping other students or get them with a premium plan
Prepare for your exams
Study with the several resources on Docsity
Earn points to download
Earn points by helping other students or get them with a premium plan
Community
Ask the community for help and clear up your study doubts
Discover the best universities in your country according to Docsity users
Free resources
Download our free guides on studying techniques, anxiety management strategies, and thesis advice from Docsity tutors
Lab manual for decompostion of KClO3 using silver nitrate solution
Typology: Lab Reports
1 / 5
This page cannot be seen from the preview
Don't miss anything!
Discussion The percentage composition of a compound is the percent by mass of each element in the compound. This can be theoretically calculated using atomic masses found on the periodic table, and experimentally calculated from lab data. The percent composition is calculated by taking the mass of the part divided by the mass of the whole times 100. In this experiment, solid potassium chlorate will be strongly heated. This causes it to decompose into solid potassium chloride and oxygen gas. The relative amount of potassium chloride (residue left behind) and oxygen gas (mass lost) are experimentally measured and compared to the theoretical values. Percent error is calculated by finding the absolute value of the difference between the theoretical and experimental values and dividing that number by the “true” theoretical value and last multiplying the answer by 100. Following the quantitative test, we will perform a qualitative test on the residue and known compounds of KClO 3 and KCl using silver nitrate solution. AgNO 3 solution is used as a general test for chloride ions. A positive test forms white solid AgCl and indicates the presence of Cl– ions in a solution. Tap water contains chloride ions, so it is very important to perform this test with clean equipment that has been rinsed out with deionized water and to use deionized water in the test. To obtain accurate and precise data you should do the following:
Procedure A. Quantitative Determination of Percent Composition
Pre-Lab Assignment (to be completed before coming to lab)