what is the molarity of a solution in which 6.9 moles of potassium chloride is dissolved in water to a final volume of 1.8 L?

There is no reason to think the results are biased or not conducted properly but you should not assume the results are correct just because they were done in a laboratory so the answer would be c. it is likely to be reliable because the results support the conclusion presented.

Ibelieve the answer is weathering,hope my answer has you : ) 

Ithink the correct answer is 3

#2- the hno3 has a h+ ion and the naoh has an oh- ion