The table below shows the color of three indicators at different pH values. An unknown liquid is tested with the three indicators:
• The unknown liquid turns litmus paper blue.
• The unknown liquid turns pink when tested with phenolphthalein.
• The unknown liquid turns blue when tested with cabbage juice.
What is the pH of the unknown solution?

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answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol