1. In the lab you will be provided with 0.1 M sodium hydroxide that you will standardize using KHP. What is implied by writing the NaOH concentration as 0.1 M?
a) After performing your standardization and calculations, any deviation from 0.1000 M is due to experimental error.
b) The concentration is known exactly to the first decimal place, with an uncertainty in the second decimal place.
c) The concentration is exactly 0.1 M.
d)The concentration is 0.1 ± 0.1 M.
I think the answer is b)?
The answer is b
To determine the correct answer, it is important to understand what is meant by "0.1 M" in the context of sodium hydroxide (NaOH) concentration. In chemistry, "M" stands for molarity, which is a unit of concentration. Molarity is defined as the number of moles of solute (in this case, NaOH) divided by the volume of solution in liters.
The statement "0.1 M sodium hydroxide" means that there is 0.1 moles of NaOH dissolved in a liter of solution. Therefore, the correct answer is indeed option c) "The concentration is exactly 0.1 M."
Option b) suggests that the concentration has known uncertainty to the second decimal place. However, the given concentration of 0.1 M implies an exact value without uncertainty beyond the first decimal place. Experimental errors may cause deviations from the intended value, but the concentration itself is intended to be exactly 0.1 M.
Therefore, the correct interpretation is that the concentration is exactly 0.1 M, as stated in option c).