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How to make 1N and 1M H2SO4 ?

Now let's see how to make 1 N and 1M  H2SO4 from 98% concentrated H2SO4 . This calculation varies with concentration of H2SO4. Because density varies with concentration of H2SO4 . Now we are having density 1.84 for 98% concentrated H2SO4.  If you are going to use less concentrated H2SO4 then first find out density of it then put that value in below formula instead of 1.84 H2SO4 is liquid, so at first we need to convert H2SO4 molecular weight (gm) into volume (ml) let's use formula density = mass / volume volume = mass of HCl  / density                             98.08 / 1.84 V = 53.30 ml Here we are making 1M and 1N  H2SO4 from 98% concentrated H2SO4. If you are going to use less concentrated H2SO4 then use that percentage value in below formula rather than 98%. Let's use formula  1M H2SO4 (98%) =  53.30 ml [ V ]                100%    ...
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Why cut onions makes us cry ?

  Onions consist of amino acid sulfoxides. When we cut an onion, millions of onions cells rupture, releasing the amino acid sulfoxides along with some special enzymes.


Image of onions 

        These special enzymes react with amino acid sulfoxides to form a chemical called  Syn-propanethial-S-oxide. 


Amino acids sulfoxides 

Syn-propanethial-S-oxide



This chemical is volatile, that is, it easily evaporates at  normal temperature, forming a gas.

        When this gas reaches to our eyes, it reacts with the substance that keeps our eyes lubricated and forms mild sulfuric acid.  This sulfuric acid gives us a burning sensation.  Now, in order to wash off this acid, our lacrimal glands  produce a disinfecting liquid.


But when our eyes cannot hold any extra amount of disinfecting liquid, it starts to fall down, making us cry.




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