Pictures provided are the experiment. UNDERSTANDING THE ExPERIMENT When the wate
ID: 530910 • Letter: P
Question
Pictures provided are the experiment. UNDERSTANDING THE ExPERIMENT When the water. solvent and BuCI are mixed, the reaction begins immediately. However, it takes time for all of the solvent to be added. For this reason, the start of the reaction, or zero time, is considered to be half way between the first and final addition of solvent. The IRXl samples cannot be measured directly so we use an indirect method, namely an acid-base titration. This works because, as the overall reaction tells us, every time a molecule of RX reacts, a molecule the Hx, produced: RX HO ROH HX Because of this one-mole-to-one-mole chemical relationship, the following relationships are true: (a) The total amount of H formed at the (time amount of RX which was end of the reaction originally present "zero" time: infinity) is a measure of the This infinity sample, IHxlne is the concentration of HCI after complete, 100% reaction. For the reaction today, the finity sample will sit without for 1 or longer before being titrated. acetone is added to the other timed samples to quench the sample (e stop the reaction) (b) At any intermediate time between "zero" and "infinity", Hx formed is a measure of the amount of Rx that has already unde the amount of rgone reaction, or [HX] mount of RX used up at time "t (original amt of RX) (amt of RX remaining at "t'") Now, although we really want to plot loglRX] against t we can't. However, because of the relationships identified in (a) and (b), we can plot an equivalent log term against log([HX] [HX]) After each titration, you will have the data needed to calculate [Hx, (the concentration of HCI in the sample at time t using the familiar relationship x M, V's x M, where M, [HX] INSTRUCTIONS A. PREPARING FOR THE REACTION. l. Pour about 110-115 mL of the water solvent into an Erlenmeyer flask, cork it and /propanol bring it to the workbenchExplanation / Answer
In the reaction RX (t-butyl chloride) is reaction with water to produce ROH (t-butyl alcohol) and HX (HCl). 1 RX molecule produces 1 ROH and 1 HX molecule. So when the reaction is finished all RX will be converted to ROH and HX, which takes infinity time.
So, basically the concentration of HX at infinity time ( when all RX has been converted to HX) is the initial concentration of RX which is completely converted to HX.
Amount of t-BuCl is 1 gram = 1/92.5 mole = 0.0108 mole of t- butyl chloride.
[ Molecular weight of t-butyl chloride is 92.5]
The volume of the reaction solution is 100 ml
So, at the beginning of reaction (when no reaction has taken place)
100 ml solution contains 0.0108 mole of t-butyl chloride
1000 ml solution contains 0.108 mole of t-butyl chloride
So the concentration of t-butyl chloride at the beginning of reaction is 0.108M
It is the concentration of HX at infinity as t-butyl chloride is completely converted to HX at the end of the reaction (at infinity time)