State three properties of a base

Bases taste bitter – There are very few food materials that are alkaline. It is even more important that care be taken...

Bases release a hydroxide ion in water solution.

Bases neutralise acids in a neutralization reaction – The word reaction means that an acid plus a base makes water plus...

Explanation:

just did the assignment and the answer was #1 +2 n

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