Molecular Weight Question

In summary, the molecular weight of potassium phosphate buffer pH 6.8 and pH 6.4 is 212.28. However, the formula for K_3PO_4 was mistyped and should be corrected. Additionally, buffers are mixtures and do not have a molar mass. The molar concentration of a buffer refers to the total concentration of both acid and conjugated base. Chemical calculators such as BATE can help with pH calculations, titration curves, and hydrolisis in labs and education.
  • #1
MusicMonkey
48
0
What is the molecular weight of potassium phosphate buffer pH 6.8 and pH 6.4? I tried to find the answer but no luck. Please help calculate. Thank you. :bugeye:
 
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  • #2
K+ PO3(4-) MW: 212.28 ... am I missing something here? how does mw change as pH changes?
 
  • #3
It does not...and while you have the corrrect MW it looks like you may have mistyped the formula for [itex]K_3PO_4 [/itex]
 
  • #4
Buffers are mixtures so there is no such thing as molar mass. Molar concentration of buffer refers to the total concentration of both acid and conjugated base.


Chemical calculators for labs and education
BATE - pH calculations, titration curves, hydrolisis
 
  • #5
Gokul43201 said:
It does not...and while you have the corrrect MW it looks like you may have mistyped the formula for [itex]K_3PO_4 [/itex]
yes, I realized that.
 

1. What is molecular weight?

Molecular weight is the mass of a molecule, typically expressed in units of daltons or atomic mass units (amu). It is the sum of the atomic weights of all the atoms in a molecule.

2. How is molecular weight calculated?

Molecular weight is calculated by adding together the atomic weights of all the atoms in a molecule. This can be done using a periodic table to find the atomic weights of each element and then multiplying by the number of atoms present in the molecule. The sum of these values is the molecular weight.

3. Why is molecular weight important in chemistry?

Molecular weight is important in chemistry because it is used to determine the amount of a substance needed for a reaction, to calculate concentrations of solutions, and to understand the physical properties of substances. It is also necessary for converting between different units of measurement and for identifying unknown substances.

4. How does molecular weight affect a substance's properties?

Molecular weight can have a significant impact on a substance's properties. Generally, substances with higher molecular weights tend to have higher boiling and melting points, lower vapor pressures, and are less soluble in solvents. This is because larger molecules have stronger intermolecular forces, making it more difficult to break them apart.

5. Can molecular weight be used to determine a substance's chemical formula?

Yes, molecular weight can be used to determine a substance's chemical formula. By finding the molecular weight of a substance and comparing it to the molecular weight of known compounds, scientists can identify the elements present in the substance and determine its chemical formula.

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