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Phenolphthalein,Hcl, NaOH, methyl orange , sodium,potassium,water,vinegar

We conducted a lab in class and my teacher gave me a lab report that is due tomorrow. We mixed phenolphthalein into hydrochloric acid and sodium hydroxide. (Turned different colours, except Hcl+pheno.) Then we mixed methyl orange into more hcl and naoh. We had to write our observations. Next she put sodium and potassium into water. (Exploded?) When she spilled hcl(I believe) she put vinegar on it for some reason. To write a purpose, I am trying to figure out the relationship between these things. Please help me.

It is clear that NaOH is a strong base that can make Phenolphthalein red. When you add HCl, it will react and form NaCl that could not make Pheno red so you see the color change. Na+H2O→NaOH+H2↑  K+H2O→KOH+H2↑As you can see, there is hydrogen, and both of the written reaction could heat the hydrogen gas and when there is enough hydrogen mixed with the air, and at the same time the temperature reach the burning point of H2, it will explode.

phenolphthalein and methyl orange are chemical indicators used to determine pH visually. phenolphthalein remains colourless in acid and pink in bases. stronger the base darker will be the colour. methyl orange is orange-red colour in acidic medium and shows yellow in basic medium. these indicatorshelp us to detect the pH change.

HCl is a strong acid while vinegar(acetic acid) is weak.basically no reaction will occur between them.

both sodium and potassium are group 1 elements. they react vigorously with water to form hydroxides and hydrogen. the reaction is highly exothermic. potassium reacts more vigorously with water than sodium. as we go down the group reativity increases.

 

 




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