294 Answered Questions for the topic Chemistry Lab

Chemistry Lab Chemistry

03/01/18

How do I write the reaction for the oxidation of copper metal to copper ions in aqueous solution?
It’s for my chemistry lab. I don’t know  how to do it 
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Chemistry Lab

02/28/18

Titration problem
25.0 mL of phosphoric acid (H3PO4) solution with an unknown concentration is titrated with a 0.100M solution of NaOH. It takes 35.42 mL of the NaOH to reach the end-point. What was the... more
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02/27/18

What observation can be written from a white ring formed from ammonia and hydrochloric acid by diffusion?
I need help on how to summarize my observation and discussion in my chemistry lab on an experiment we did in the lab about diffusion where a white ring was formed when two wool was soaked in... more
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Chemistry Lab Chemistry Chem Concentration

02/25/18

Whats the correct way to approach this concentration question?
Part I. Preparation of a Fe(III)-oxalate complex: (4 pts) a) Recorded mass of Fe(NH4)2(SO4)2●6H2O used: 1.3807 (g) b) pH paper color upon addition of oxalic acid: Magenta c) Does this color... more
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02/25/18

Calculate the theoretical yield of salicylic acid when you start with 2.7 grams of methyl salicylate and an excess of sodium hydroxide. Assume complete conversi
Chemistry Help please!
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Chemistry Lab

02/25/18

How many tablets?
 A good yield for their synthesis, 0.763 g. How many tablets of aspirin could they make from this? There are 324 mg aspirin/ tablet.
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02/21/18

Diels-Alder Lab Question
Do you expect there to be differences in the IR for the carbonyl stretches of maleic anhydride and the Diels-Alder adduct? If so, draw their structures and state which one you would expect to have... more
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Chemistry Lab Chemistry

02/18/18

Precipitate (Chemistry)
Given a "substance A" that reactswith a "substance B" to form aprecipitate. If you have an "unknownsolution" and add some substance Bin it, and get a precipitate, does itmean that your "unknown"... more
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02/12/18

If a 5.0 mL test tube has a concentration of 0.051 M iron, what is the mass of iron (in mg) in the test tube
please help!!!
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02/12/18

During the experiment, you recover 2.8 mg of Fe by testing 100 mg of powder.
Assume a full pill weighs 300 mg and contains 27.0 mg of Fe. What is the % recovery for your experiment? In other words, what percentage of the total Fe in the pill did you recover?
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02/11/18

Order of Reaction and rate constant
The total pressure in atmospheres was recorded during the decomposition of acetaldehyde (CH3CHO(g)) at 701K for certain time intervals shown in the chart. Use the information to answer the... more
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Chemistry Lab

02/08/18

Brewing tea and water together
Say I have a pot of brewed tea containing only the tea and water. Is there a specific ratio of the two ingredients that prevails to actually call the compound tea?
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Chemistry Lab

01/29/18

how many grams of sodium hydroxide are needed to prepare 235 ml of a 5.0% (m/v) solution?
need help. please axplain and describe the work needed to get to answer if possible.
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Chemistry Lab

01/29/18

How many gm/mL of glucose and water are in 500mL of a 5.3% glucose solution?
This is a measurement lab for cell and molecular biology, however preparing concentrations by using w/v%, v/v, etc.
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Chemistry Lab Chemistry

01/29/18

When a student mixed 46.1 mL of 0.100 M NaOH with 50.0 mL of 0.100 M HCl, they found that 144.5 J of energy was produced.
Based on these results, what is the molar heat of reaction in kJ per mole?
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Chemistry Lab

01/29/18

If you mix 45.4 mL of 1.000 M NaOH with 45.4 mL of 1.000 M HCl, what is the concentration of NaCl(aq) in the resulting solution? Report your answer to one deci
Help, I do not know where to even begin with this question! Due in less than 2 hours!
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Chemistry Lab Rounding Decimals

01/28/18

How do you round .47 to the ones place?
Would it be 0 since the four is less than 5? Or would the 7 round up the 4 which would then make it 1? 
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01/22/18

Hi! Are Delta Hsolution and Delta Hreaction the same value in dissolution?
Hi! Are Delta Hsolution and Delta Hreaction the same value in dissolution? Please help! I know qrxn and qsolution are opposite(signs). I'm confused as to if DeltaHsolution and DeltaHreaction are... more
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Chemistry Lab

01/04/18

Calculate the mass of 4.5×10^ 8 molecules of nitrogen
Calculate the mass of nitrogen molecules give the molar number
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12/17/17

Can you tell from the formula of a substance whether the bonds are likely to be ionic or molecular in nature?
is it possible, or is it not? WHY?
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12/12/17

A Zn wire and Ag/AgCl reference electrode (E° = 0.197 V) are placed into a solution of ZnSO4.
A Zn wire and Ag/AgCl reference electrode (E° = 0.197 V) are placed into a solution of ZnSO4. The Zn wire is attached to the positive terminal and the Ag/AgCl electrode is attached to the negative... more
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12/11/17

A Zn wire and Ag/AgCl reference electrode (E° = 0.197 V) are placed into a solution of ZnSO4.
A Zn wire and Ag/AgCl reference electrode (E° = 0.197 V) are placed into a solution of ZnSO4. The Zn wire is attached to the positive terminal and the Ag/AgCl electrode is attached to the negative... more
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Chemistry Lab Chemistry

12/04/17

Preparing 5 dilutions of 0.200M NiSO4?
I’m supposed to be preparing five dilutions from 50.0 mL of 0.200M NiSO4 stock solution. Instructions say that I will need standard solutions with five different concentrations and all standards... more
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Chemistry Lab Chemistry

12/02/17

Preparing 5 dilutions of 0.200M NiSO4?
I’m supposed to be preparing five dilutions from 50.0 mL of 0.200M NiSO4 stock solution. Instructions say that I will need standard solutions with five different concentrations and all standards... more
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12/02/17

Galvanization
I'm a little confused on how to find the mass of zinc consumed from the data: Mass of zinc produced: .745g Mass of Zinc electrode before 7.705g Mass of Zinc electrode after 8.450g Length of... more
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