Preparation of standard stock solution

Click For Summary

Discussion Overview

The discussion revolves around the preparation of a standard stock solution from Lyphochek serum, focusing on the calculation of its concentration. Participants are examining the methodology and accuracy of the calculations involved in this chemistry homework problem.

Discussion Character

  • Homework-related

Main Points Raised

  • One participant presents a calculation for the concentration of a standard stock solution derived from Lyphochek serum, converting the initial concentration and applying dilution principles.
  • Another participant questions the number of significant figures used in the calculation, suggesting that the precision may be excessive.
  • Some participants argue that significant figures may not be critical in this context, implying a more practical approach to the answer.
  • There is a suggestion that the use of deciliters (dL) as a unit may be unnecessary, with a preference for simpler units.
  • One participant expresses a desire to confirm the correctness of their calculation rather than focusing on the units or significant figures.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the importance of significant figures or the appropriateness of using dL as a unit. The discussion remains unresolved regarding the correctness of the initial calculation.

Contextual Notes

There are unresolved questions regarding the significance of significant figures in the context of this calculation, as well as the appropriateness of the units used.

Nanu Nana
Messages
95
Reaction score
5

Homework Statement


In this experiment we will create a standard stock solution from lyphochek serum. The concentration of proteins in serum Lyphochek is 6,8 g / dl. Pipette 1.36 mL Lyphochek serum in a 25 mL volumetric flask and dilute with physiological water. Calculate the standard stock solution concentration that you will make.

Homework Equations


c=n/v[/B]

The Attempt at a Solution


6,8 g/dl = 0,068 g/mL
0,068 g/mL x 1,36 mL = 0,09248 g / 25 mL = 0,0036992 g/mL
369,92 mg/ dl is the answer

is this answer correct ?? [/B]
 
Physics news on Phys.org
Logic is OK, but where did you got so many significant figures from?
 
Significant figures doesn't really matter here I think
 
Borek said:
Logic is OK, but where did you got so many significant figures from?
thank you for your answer
 
370 is all you'll ever need.
Are you forced to use horrible, unnecessary dL units?
 
epenguin said:
370 is all you'll ever need.
Are you forced to use horrible, unnecessary dL units?
Not really . I just wanted to know if my calculation was correct or not
 

Similar threads

  • · Replies 19 ·
Replies
19
Views
7K
  • · Replies 6 ·
Replies
6
Views
5K
  • · Replies 5 ·
Replies
5
Views
2K
Replies
9
Views
3K
  • · Replies 5 ·
Replies
5
Views
7K
Replies
6
Views
2K
Replies
1
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 6 ·
Replies
6
Views
7K
  • · Replies 11 ·
Replies
11
Views
3K