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Benzidine reagent is used to test blood in urine. It needs to be freshly prepared in order to obtain best results, otherwise, possible contamination may occur.
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What is reagent bottle and how is used?
used as a container where you put chemicals that can't be thrown in the sink.
What should you do when you have finished using a reagent?
wash hands and clean glassware
Why should screw cap of a reagent bottle be placed bottom up on the table?
If the cover of a reagent bottle is placed on a table with the bottom down, it can pick up material from the table which would contaminate the contents of the reagent bottle after the cap is put back on the bottle.
Why must the glass stopper of a reagent bottle never be placed directly on the laboratory bench?
The stopper of a chemical reagent container should be handled carefully for two reasons. Firstly, it may contain chemical residues which can be dangerous. Additionally, if the stopper is dirtied it may contaminate the reagent in the bottle when the stopper is put back on.
If the weather map shows many pressure gradients close together what things should you take to be prepared for the day's weather?
You should be prepared for strong wind.
Why should only freshly prepared solution of ferrous sulphate solution be used?
baking soda
Why do you need freshly prepared starch solution for iodometric titration?
because,starch undergoes a photochemical reaction. So, with the passage of time it can under go to the photochemical reaction and starch wouldnot be starch but it might have changed in anyother product. so...we should use freshly prepared starch.
Why alkaline picrate should be freshly prepared?
Many of the picrates are explosive and dangerous to store; fresh preparation limits the time that this is a risk. They also can react with their container or decompose so freshly prepared solutions will be more reliable for some processes like the Jaffe reaction to test for creatinine where the exact concentration is important in order to properly calibrate the results of the test.
Should you dye your hair when it's greasy or freshly washed?
Freshly washed.
What is reagent bottle and how is used?
used as a container where you put chemicals that can't be thrown in the sink.
What should you do when you have finished using a reagent?
wash hands and clean glassware
Why should the spatula used for spooning solid chemical from a reagent bottle be clean and dry?
So you don't get water, dirt or other contaminants in the reagent bottle. The reagent bottle should contain chemicals that are as pure as possible. If each person put a dirty spatula in the bottle, the reagent bottle would very quickly accumulate all kinds of junk, ruining the chemicals inside or causing hazardous chemical reactions.
What is the main verb in this sentence should have prepared?
prepared
Why should screw cap of a reagent bottle be placed bottom up on the table?
If the cover of a reagent bottle is placed on a table with the bottom down, it can pick up material from the table which would contaminate the contents of the reagent bottle after the cap is put back on the bottle.
When should a career portfolio be prepared?
A career portfolio should be prepared before starting a job search.
How should urinalysis reagent strips be stored and cared for?
store in original container at room temperature
How do you overcome the disadvantages of starch indicator?
All the alpha amylase molecules should rupture . Boil water and then add to the boiling water required starch. Make sure that the starch is alpha and not beta amylase. Use freshly prepared starch solution for iodometric titrations. --unnikrishnan
