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Why would the pH value pf a prepared buffer differ from the predicted value?
Wiki User
∙ 13y ago
The calculated pH may be different from measured pH because when measuring the pH of the solution a pH meter is used to do so. However the Glass electrodes found in common pH meters respond not to the concentration of hydrogen ions, but to their activity, which depends on several factors, primarily on the ionic strength of the media. For example, calculation of pH of phosphate-buffered saline would give the value of 7.96, whereas the actual pH is 7.4.
Wiki User
∙ 13y ago
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How you standardize pH meter?
Standardize the pH meter using a buffer solution of known pH value.Basically take buffer of pH value 4.Then set zero reading in the pH meter.Now remove unknown buffer solution.(take care with atmospheric temperature.)
What is the difference between NIST buffer solution and USA buffer solutions?
When setting up your pH meter you need to specify that the standard solutions are NIST, USA, China or Custom standards. Typically pH meters will automatically identify the pH 7 buffer standard as 6.86 for the NIST selection and 7.00 for the USA selection. The pH 4 buffer standard value will be identified as 4.01 for the NIST selection and 4.00 for the USA selection. The pH 10 buffer standard value will be identified as 9.18 for the NIST selection and 10.00 for the USA selection. A "Custom" selection on your pH meter will allow you to make your special selection of the standards you want to use. Read the calibration meter set up section of your pH meter manual and check your pH buffer standard labels to ensure you match your pH meter set up to the standards you intend to use.
What is a solution that resists changes in the concentration of hydrogen ions caused by the addition of an acid or a base?
it is called a buffer. there would be minimal change in pH value if this solution is added
What is the titration curve of phenylalanine?
The titration curve of phenylanaline is around pk value 6.89 which neutral pH. It has a two buffer one in the acidic portion and the neutral one.
Importance of buffer solutions?
Buffers or buffer solutions are aqueous solutions consisting of a mixture of a weak acid and its conjugate base or a weak base and its conjugate acid. It has the property that the pH of the solution changes very little when a small amount of strong acid or base is added to it. Buffer solutions are used as a means of keeping pH at a nearly constant value in a wide variety of chemical applications. Many life forms thrive only in a relatively small pH range; an example of a buffer solution is blood.
How do you prepare sodium succinate buffer?
Prepared 0.5M succinic acid and 0.5 NaOH and adjusted pH to desired value
What is predicted y?
if x is 500, or predicted value of y is ?
What does forevalued mean?
Predicted the value of
Why are people never reach their predicted value?
A person can not have a value, slavery is outlawed.
Effect of Diluting a buffer?
The buffer capacity increases as the concentration of the buffer solution increases and is a maximum when the pH is equal to the same value as the pKa of the weak acid in the buffer. A buffer solution is a good buffer in the pH range that is + or - 1 pH unit of the pKa. Beyond that, buffering capacity is minimal.
In reference to the equation -0.25 0.08x1 0.10x2 the value -0.25 is?
predicted value of y
What is the percent error if the predicted value is sixty eight and the actual value is eighty?
2o
How you can select buffer in hplc according to pka value?
By following + or - 2 pH to the pKa value
How may people's value and beliefs differ?
describe how people's value and beliefs may differ
What is the value of an Adolf Hitler ring?
The value of any item is predicted by what a buyer is willing to pay for it.
Why is cellular pH kept near a value of 7?
buffer systems
What is the definition of a buffer in chemistry?
As a noun, "buffer" in chemistry means a mixture of at least two materials that resists changes in pH value when small amounts of acid or base are added to the mixture. As a verb, "buffer" in chemistry means to add at least one substance to a substance or mixture that is not originally a buffer that will cause the mixture formed by the addition to become a buffer in the noun sense.
