Identify the indicator that can be used at the highest ph.

A universal indicator may be used in measuring the highest pH. It is a combination of different pH indicators such as thymol blue, methyl red, bromothymol blue, and phenolphthalein. A universal indicator has a pH value range of 0-14, with distinct and smooth color changes for each pH level.

idk what is it? is this a question that you know the answer or u dont

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