help pls give answers for all these questions
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Answers
Answer:
Alright here we go !
1) The acid present in vinegar is acetic acid or more commonly known as ethanoic acid.
2) The solution having pH 1 is more acidic than the solution having pH 4 since pH gives the negative exponent of Hydrogen ion concentration in solution to the power of 10.
and, clearly because 10^-1 > 10^-4 it's the PH 1 solution which is more acidic.
3) The pH of rain water is often between 6-6.5, i.e it is slightly acidic however for acid rains it is 5.6-5.7 specifically.
Hence, blue litmus will turn red.
4) The chemicals used in fire extinguisher are Dil Sulphuric acid along with Sodium Carbonate so that when the reaction is made to occur, the Carbon dioxide gas emitted helps in extinguishing the fire immediately
11) NaOH + Zn ----> Na2ZnO2 + H2
where Na2ZnO2 is known as sodium zincate and along with this slow emission of Hydrogen gas occurs.
12) The correct reaction is already mentioned In the image of the question.
9) When crystals of washing soda which is Na2CO3 * 10H2O are kept in open in air for long time, they lose these 10 molecules of water of crystallisation and become white in colour due to anhydrous nature now.
10) Common salt is mainly added to neat soap after the saponification reaction so that the glycerin formed along in the reaction can be easily separated.It is mainly added for easier precipitation to separate out glycerine from the solution.
Hope this helps you since I answered all of these questions ! ｡◕‿◕｡
Answer:
Ans. 1 : Acetic Acid.
Ans. 2 : pH 1.
Ans. 3 : The colour of the pH paper will be red as rain water is acidic in nature.
Ans. 4 : The most important chemical used in fire extinguisher is sodium bicarbonate / sodium hydrogen carbonate / baking soda. NaHCO3
Ans. 9 : When sodium carbonate crystals are exposed to air they lose water of crystallization and turn to white powder. This process of losing water of crystallization when exposed to air is called efflorescence.
Ans. 10 : Common salt is mainly added to the neat soap after the saponification reaction when the soap is washed with NaCl or brine solution in order to separate glycerin. It is mainly added for precipitation to separate it from the aqueous solution. Salt is also used in order to separate "glycerol" from the water.
Ans. 11 : 2NaOH + Zn --> Na2ZnO2 + H2
Ans. 12 : Since egg shell is made of calcium carbonate. And we know that when calcium carbonate (CaCO3) reacts with nitric acid (HNO3) then carbon dioxide, calcium nitrate and water are formed. So same reaction happens when nitric acid is added to an eggshell.
Reaction: CaCO3 + 2HNO3 --> Ca(NO3)2 + CO2 + H2O.
Thank you!
Hope this helps you.