288 Answered Questions for the topic Chemistry Lab

09/05/18

Chemistry lab
The molar extinction coefficient of a complex of iron is 12,000 L mol-1 cm-1 with minimum detectable absorbance 0.01. What is the minimum concentration needed for minimum detection in a cell of... more
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09/03/18

If a student reacts 4.40 mL of acetic acid with 3.35 mL of isopentyl alcohol and obtains 3.25 mL of isopentyl acetate as the product, what was the percent yield
Isopentyl acetate can be prepared by an esterification reaction using acetic acid and isopentyl alcohol. The balanced reaction is shown below. (Acetic acid has MW of 60.0 g/mol & density of... more
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09/03/18

A student prepares benzoic acid by hydrolyzing 6.47 g of methyl benzoate (FW 136.15 g/mol) using excess sodium hydroxide. If the student recovers 3.71 g of benz
Ig the student recovers 3.71 g of benzoic acid (FW 122.12 g/mol), what was the percent yield of the reaction?
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09/03/18

Calculate the theoretical yield (in grams of acetic acid, FW 60.05 g/mol) if 8.79 mL of acetic anhydride (FW 102.09 g/mol, density 1.08 g/mL) is used.
When acetic anhydride is dissolved in water, it forms acetic acid according to the balanced chemical reaction shown below. Calculate the theoretical yield (in grams of acetic acid, FW 60.05 g/mol)... more
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09/03/18

An aqueous solution is 3.0M hydrochloric acid and has a density of 1.1 g/mL. How many mmol of hydrochloric acid are present in 25 mL of this solution
 Chem
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08/26/18

What are the answers to these Enthalpy questions? I need to check my them homework please
1.H2O(l) H2O(g)2.2 SO2 (g) + O2 (g) 2 SO3 (g)3.SO3 (g) + H2O(l) H2SO4 (l)4.2 HI(g) H2 (g) + I2 (s)5.4 NH3 (g) + 5 O2 (g) 4 NO(g) + 6 H2O(l)6.CH4 (g) + 2 O2 (g) CO2 (g) + 2 H2O(g)7.CH4 (g) + 2 O2... more
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08/22/18

Does mixing chemicals always lead to a chemical reaction
I need help for the writing part of my chemistry lab.
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08/14/18

a sheet of copper had a volume of 0.947mL. Use the density of copper (8.95g/mL) as a unit of conversion to calculate the mass of the copper.
 about the conversions between volume and mass 
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07/29/18

What would happen to the formation constant?
How would the formation constant for [Cd(NH3)4 2+] be affected (increase, decrease, or no change) if not all of the CdC2O4 precipitate reacted with NH3? Justify your answer.
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07/08/18

How does burning a compound compare to it's reading in a spectrophotometer?
for example, burning copper chloride, and also analyzing it in solution in a spectrophotometer.
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07/03/18

what can i say for the conclusion armspan vs height with the 0.98 positive correlation coefficient
I need help with this question
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06/28/18

Aspirin Synthesis Lab - What chemicals are present in each step?
Aspirin is prepared from salicylic acid via an esterification reaction, which involves forming an ester (ASA) from an alcohol (salicylic acid) and carboxylic acid derivative (acetic anhydride), in... more
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06/14/18

the factors influencing purity, eg during recrystallisation, filtration and drying of an organic compound.
I need help with this question
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06/14/18

evaluate the accuracy of the measurements made, contrasting them with wet techniques, where eg. (determination of Cu2+ concentration by titration and
by colourimetery
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06/13/18

Using mole ratio to determine concentration of a reactant?
S2O82- + 2 I- --> 2 SO42- + I2   (reaction 1)       [I-]=0.20M, [S2O82-]=0.10M      2 S2O32- + I2 --> S4O62- + 2 I-  (reaction 2)      [S2O32-]= 0.0050M   I need to determine the... more
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05/30/18

Is the reaction rate dependent on the concentration of the excess reagent?
If a higher concentration means a higher rate of reaction because of more collisions, then does the reaction rate depend on the concentration of the excess reagent? 
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05/16/18

write chemical, complete ionic and net ionic equations for the reaction between CaCl2 and NaCO3
I cannot figure it out, although i think that it has something to do with a double replacement reaction.
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05/11/18

How many moles of CaCl2 are in a solution of prepared by diluting 250 mL of a 3.0 M of CaCl2 to 750 mL?
I tried to use the fomrula M1V1=M2V2. but still had a hard time getting to the answer of 0.75 mole.
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05/11/18

When 200. mL of water are added to 100. mL of 12% KCl solution the final concentration of KCl is?
Assume the volumes add.
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05/09/18

Titration question.
This is the full question    Samples of hydrochloric acid, of unknown concentration, were titrated with a solution of sodium carbonate. The flasks were rinsed with sodium carbonated stock... more
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05/03/18

a 250ml, 3 M solution of silver acetate is concentrated to a 12 M solution, what is the new volume?
a 250 ml,3 M solution of silver acetate is concentrated to a 12 M solution , what is the new volume
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05/03/18

a 250ml, 3 M solution of silver acetate is concentrated to a 12 M solution, what is the new volume?
A 250 mL, 3 M solution of silver acetate is concentrated to a 12 M solution, what is the new volume? 
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05/01/18

Balance this equation. _Pb(NO3)2+_HCl
Balnace the equation
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04/24/18

My question is in the description
A titration is done using 0.10 M NaOH in the buret and 15.0 mL of 0.18 M HCl in the Erlenmeyer Flask. How many moles of HCl are left in the flask after a total of 5.0 mL of the 0.10 M NaOH solution... more
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04/17/18

If the concentration of glucose is increased from 0.1 M to 2.0 M, will the conductance change?
If the concentration of glucose is increased from 0.1 M to 2.0 M, will the conductance change?
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