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  • A teacher provided acetic acid, water, lemon juice, aqueous solution of sodium hydrogen carbonate and sodium hydroxide to students in the school laboratory to determine the pH values of these substances using pH papers. One of the students reported the

A teacher provided acetic acid, water, lemon juice, aqueous solution of sodium hydrogen carbonate and sodium hydroxide to students in the school laboratory to determine the pH values of these substances using pH papers. One of the students reported the pH values of the given substances as 3, 12, 4, 8 and 14 respectively. Which one of these values is not correct ? Write its correct value stating the reason. 

 

 

 

 
 
 
 
 

Answers (1)

\begin{array}{|l|l|l|} \hline \text { Given substance } & \text { Given } \mathrm{pH} & \\ \hline \text { Acetic acid } & 3 & \text { Correct } \\ \text { Water } & 12 & \text { Incorrect } \\ \text { Lemon juice } & 4 & \text { Correct } \\ \mathrm{NaHCO}_{3}(\text { aq }) & 8 & \text { Correct } \\ \mathrm{NaOH}(\text { aq }) & 14 & \text { Correct } \\ \hline \end{array}

Correct pH for water will be 7, because it is neutral in nature.

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Satyajeet Kumar

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