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What is the hardness of coal?
The hardness of coal can vary depending on its type and rank, but generally it is considered to have a hardness ranging from 1 to 3 on the Mohs scale. It is softer than most minerals and rocks, making it easier to break or crush.
Why is it that mohr's method of titration for the determination of halide must be performed in neutral?
When pH is lower than 7, chromic ion gets protonated and chromic acid is predominant in the solution. Consequently, if the pH is above 7, chromate ion concentration is too low to form precipitate with silver ions at the end point. If the pH is above 10, brownish silver hydroxide is formed masking the end point. hence a neutral medium must be maintained
Why iodometic titration is better than iodimetric titration?
Iodometric titration is better than iodimetric titration for the determination of reducing agents, as it directly measures the amount of oxidizing agent present. This method is more precise, as it involves the direct reduction of a known quantity of iodine to iodide ion. It is also less prone to interference from side reactions compared to the indirect measurement in iodimetric titration.
Why is electrometric method of pH determination more accurate than colorometric method?
The electrometric method of pH determination provides a single value dependent on the concentration of hydrogen ions in the aqueous solution being tested. The colorimetric method of pH determination uses acid-base indicators to provide a range of values for a solution's pH, and is therefore less accurate than the electrometric method.
Why do we add dilute sulphuric acid to dissolve mohr's salt?
For preparation of standard solution of Mohr salt {FeSO4.(NH4)2SO4.6H2O}, it's necessary to add dilute H2SO4 to prevent the Fe2+ ions of Mohr salt solution from undergoing oxidation (to Fe3+). Just try to prepare the standard solution without adding this acid. You'll observe that your "Mohr solution" will become yellow in colour, i.e., it won't remain "Mohr salt solution" anymore, hence can't be used in titration. And while doing the titration of the Mohr salt solution with KMnO4 (or even with K2Cr2O7), you need to add dilute H2SO4. The reason is well explained by the chemical equation involved: reduction: (MnO4)- + 8H+ + 5e ----> Mn2+ + 4H2O oxidation: Fe2+ ----> Fe3+ + e net equation: (MnO4)- + 8H+ + 5Fe2+ ----> Mn2+ + 4H2O + 5Fe3+ There is involvement of H+ ions in this reaction. This redox titration requires acidic medium. Moreover, KMnO4 acts as a very good oxidizing agent in the presence of acidic medium, than in the basic and neutral medium. NOTE: Now a query may arise that for providing acidic medium, can HCl or HNO3 be used? (Let me tell you it's one of the favourite questions of external examiners) The answer is NO, because HNO3 is a very strong oxidizing agent. So, the Fe2+ present will be oxidized both by KMnO4 and HNO3, which will result in an error in determination of volume of KMnO4 reacting with Mohr salt solution. Also, HCl can't be used because Cl- from HCl will be oxidized by KMnO4: HCl (aq) ---> H+ (aq) +Cl- (aq) oxidation by KMnO4=> 2Cl- ----> Cl2 + 2e So, some extra KMnO4 will be used up because it will oxidize both- Cl- as well as Fe2+, => error in titration.
Which method of transportation that proved to be better than canals?
railroads were better transportation than canals
Why two probe method is better than four probe method?
the question is wrongfour prob is better than two prob method as it eliminates the effect of wire imbedance as well as contact resistance
Does the streak plate method work better than the pour plate method?
I 4 got
Why is westergren method is better than wintrobe method?
Both procedures are accurate but westergren is easier.
The method of transportation that proved to be better than canals was?
railroads
Is there a better method to finding fingerprints than iodine?
yes,yes there is
Why were ships better than method of transporting goods?
.... Face palm ....
Is their a better technique used than the iodine method to show fingerprints?
it would be charcoal dust that works better than iodine
Which is the best method for Cathodic protection. Sacrificing anode method or Impressed current method?
When reliability is concerned then ICCP method is superior but when overhead cost incurred in installation and maintenance is concerned then sacrificing anode method is better than ICCP method. When reliability is concerned then ICCP method is superior but when overhead cost incurred in installation and maintenance is concerned then sacrificing anode method is better than ICCP method.
Why osmotic method for calculation of molecular weight is better than boiling point method?
The osmotic method is better because some solutes and/or solvents are decomposed by the heating required to cause a solution to boil.
Is autodialer software better than hardware predictive dialers?
An autodialer is a better method than a predictive dialer. This is due to the repetiive task of dialing.
How do you pronounce mores?
You can pronounce it more than one way. mawr-eyz, or -eez, or mohr-.
