Can anyone help with these questions and provide explanations for answers? Thank
ID: 510109 • Letter: C
Question
Can anyone help with these questions and provide explanations for answers? Thanks.
Two samples are spotted onto a TLC plate and the plate is developed and visualized. The resulting Rf values for Sample A and Sample B are given in the table below. Based on the information given, select the correct statement. a. One of the compounds present in Sample A may also be present in Sample B b. None of the compounds present in Sample A are present in Sample B c. The samples each contain five compounds d. One of the compounds present in Sample A is definitely present in Sample B TLC is a qualitative technique. Why can it not be considered quantitative? Why do we use bleach to clean clothing? (Please answer using the knowledge gained from the experiment)Explanation / Answer
1) Answer: d) One of the compounds present in sample A is definitely present in sample B.
2) Under standard conditions, TLC is used as qualitative analysis. The main reason for it can not be used as quantitative analysis is the quantity of handling sample which is very low. Although it is possible but combursome to recover the eluted sample with high accuracy in such low quantity. Because of that chances of error is very high.
3) Generally, bleach is used to whiten the dark clothe. A bleach is nothing but an oxidising agent which oxidises the chromophores, reponsible for colour, present in the clothe. Because of this oxidation of chromophores, the clothe looses its colour and this absence of colour is seen as white. Common bleach chemicals are sodium hypochlorite and hydrogen peroxide. They also do the job of disinfecting the clothe by killing germs, molds and bacteria.