Question
In: Chemistry
Describe how the solutions used in standard calibration curves differ from those used in a standard...
Describe how the solutions used in standard calibration curves differ from those used in a standard addition curve?
Describe how the concentration of an unknown analyte is found from a standard addition curve?
Why is distilled water used as a calibration blank?
Solutions
Expert Solution
standard calibration curve : In analytical chemistry, a calibration curve is a general method for determining the concentration of a substance in an unknown sample by comparing the unknown to a set of standard samples of known concentration.[1] A calibration curve is one approach to the problem of instrument calibration; other approaches may mix the standard into the unknown, giving an internal standard.
standard addition curve: The method of standard addition is a type of quantitative analysis approach often used in analytical chemistry whereby the standard is added directly to the aliquots of analyzed sample. This method is used in situations where sample matrix also contributes to the analytical signal, a situation known as the matrix effect, thus making it impossible to compare the analytical signal between sample and standard using the traditional calibration curve approach.
Describing the concentration of an unknown analyte is found from a standard addition curve:
Example
standard addition plot. This graph is an example of a standard
addition plot used to determine the concentration of calcium in an
unknown sample by atomic absorption spectroscopy. The point at zero
concentration added Ca is the reading of the unknown, the other
points are the readings after adding increasing amounts ('spikes')
of standard solution. The absolute value of the
x-intercept is the concentration of Ca in the unknown, in this
case 1.69E-6 g/mL.
Why is distilled water used as a calibration blank?
Distilled water/deionised water is used in calibration blank for the preparation of standered solutions of known and unknown samples.
queen_honey_blossom answered 2 years agoRelated Solutions
How do the requirements for a standard SBA loan differ from those for a SBA microloan...
Discuss how the reproductive rights of minors differ from those of adults.
. How does the demand curve for monopolistic firm differ from the demand curves for firms...
Explain and describe how the thought processes used by young adults differ from the thought processes...
Briefly explain an NTFS Standard Permission and what it is used for. How are those different...
How does the finance concept of gross income and operatingexpenses differ from those studied in...
How do the rules applied to a cost matrix differ from those applied to a profit...
How do the cost flows in a retail organization or service organization differ from those in...
How do the typical drinking patterns of Jews differ from those of Conservative Protestants (such as...
e parts of the introduction of a business report? How do they differ from those found...
- What experience have you had with Organization Development or with Change Management? Describe the organization, the...
- 1. Renfro Rentals has issued bonds that have a 12% coupon rate, payable semiannually. The bonds...
- Given an array of positive integers a, your task is to calculate the sum of every...
- Define “culture.” Software is defined by the Merriam-Webster Dictionary as "the programs that run on a...
- In humans, hypotrichosis (sparse body hair) is a rare autosomal recessive condition. Let h = hypotrichosis...
- Increase all of the listing prices by 5% for all listings under $500,000 and 10% for...
- Samsung Industry that requires you to act as a change agent to form an organizational change...