321 Answered Questions for the topic Chemistry Lab

Chemistry Lab

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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Chemistry Lab

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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Chemistry Lab Chemistry

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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Chemistry Lab

07/08/18

Why is water added in two separate portions to the acetic anhydride/concentrated h2so4 mixture?
Lab question about esters and preparation of aspirin 
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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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Chemistry Lab Chemistry Concentration

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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Chemistry Lab

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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Chemistry Lab

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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Chemistry Lab Titration

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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Chemistry Lab How To Solve The Problem

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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Chemistry Lab How To Solve The Problem

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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Chemistry Lab

05/01/18

Balance this equation. _Pb(NO3)2+_HCl
Balnace the equation
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Chemistry Lab

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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Chemistry Lab

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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04/15/18

What causes vitamin C concentration to increase in freshly squeezed orange juice?
Hi. In year 13 Chemistry we titrated an iodine solution with freshly squeezed orange juice which had been stored at different temperatures. We keep the orange juice solution in an incubator to... more
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04/13/18

how to reduce solution that could be trapped in the pores of the filter paper for example aspirin
I need help
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04/11/18

how does impurities affect filtration and drying of aspirin
I need help with this question
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04/11/18

describe the factors that influence purity in filtration and drying.
I need help with this question.
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Chemistry Lab

04/10/18

Chemistry Lab - Molality of a Solution
Hello,   I am finishing up my chemistry lab,  and am having trouble solving a question.  I clearly am missing something here, but I cannot figure out what it is.   The question... more
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04/10/18

how does the lattice structure cause impurities?
I need help
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