1. If only one cyllinder was used to measure both acid and the base solution. Some of the acid has already been neutralized in the cyllinder by the base. Thus the heat generated inside the calorimeter during the experiment would be lower than the actual heat and so dH neutralization would be lower than the actual value.
2. Effect of the given changes,
(2) A glass beaker is not a perfect insulator and some of the heat would be lost from it to the surrounding. Thus the dHneutralization would be lower than the actual value. therefore, a perfect insulator such as pressed polystyrene cup is used.
(2) No effect, it would give the same result with no loss of heat.
3. Reaction of HBr or HNO3 with NaOH
(1) Net ionic equation for both,
H+ + OH- <==> H2O
(2) Both aqueous bases KOH and NaOH has OH- as the common reacting species with the added acid H+.
(3) Both the acids would yield the same dHneutzn as both react in 1 : 1 molar ratio with the added base.
HBr + NaOH ----> NaBr + H2O
HNO3 + NaOH ---> NaNO3 + H2O
21 THER 368 Hear of Post-Laboratory Questions (Use the spaces provided for the answer and additional...
Can
you answer 2 to 5?
Post-Laboratory Questions Use the spaces provided for the answers and additional paper if necessary.) A student was given only one graduated cylinder3. The accepted &Hheutan of hydrobromic acid experiment. After using it to measure (HBr) reacting with NaOH solution and of HNO he student failed to reacting with potassium hydroxide (KOH) solution 50.0 mL of the assigned acid, t rinse or dry the cylinder before measuring out the are identical. 50.5 mL of the...
Post-Laboratory Questions (Use the spaces provided for the answers and additional paper if necessary.) 1. Briefly explain whether the following procedural changes would have caused the calculated number of waters of hydration in a hydrate sample to be too high, too low, or unaffected. (a) A student washed the crucible, but failed to heat it to dryness prior to weighing it at the start of the experiment. (b) A student was anxious to finish the experiment and heated the crucible...
THER 112 The Themodynamics of Porasiun Nirate DingWe Post-Laboratory Questions (Use the spaces provided for the answers and additional paper it necessary) 1. (a) Is the process of KNO, dissolving in water spontaneous at all tomperatures studied? Brielly 3. (a) What assumption is made about the reac- tion at the temperature at which crystais become visible? explain, (b) Is the reaction in (a) one that gives oft heat or requires heat? Briefly explain. (b) If this assumption were not true,...
number 2
SYNT 439: Synthesizing Aspirin Post - Laboratory Questions (Use the spaces provided for the answers) 1. (1) A student who was in a hurry to complete this experiment did not completely dry the crystalline product before doing the final weighting. How would this error affect the calculated percent yield of the experiment? The results Hughes weight because the crystal has some moisture. It can be added in to own original product weight. So it results high molecular weight....
please use the information provided above to answer
the questions below (the 2 worksheet)
_35%. 1:59 AM Introduction In chemistry laboratory, it is sometimes necessary to experimentally determine the concentration of an unknown acid or base solution. A procedure for making this kind of determination is called an acid-base titration. In this laboratory process, a solution of known concentration, called the standard solution, is carefully added to a solution of unknown concentration until the mixture becomes neutral. The neutral point...
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uploaded everything that was given. Where would I find the
experiemental values?
Complete the calculation summary below. READ THE EXPERIMENTAL DISCUSSION FIRST! REPORT ALL ANSWERS TO THE CORRECT SIGNIFICANT FIGURES. SHOW CALCULATION SET-UP on the next page. PART B: Molarity Determination via Solution Stoichiometry 7.625 g Mass of Empty 50 mL Beaker 7.976 g Mass of Beaker and NaCl (final heating) Mass of NaCl Produced (Experimental Yield of NaCl) moles Moles of Na,CO, Consumed 0.00500 Liter Volume of Na,CO,...