0
so that weighing errors are minimized
Wiki User
∙ 14y ago
Add your answer:
Earn +20 pts
What is the molecular weight for Vitamin E?
Molecular formula: C29H50O2 Molecular weight: 430.71 CAS Number: 2074-53-5
How do you calculate the molecular weight and the uncertainty of the molecular weight of a unknown solute using propagated error?
vkhgvk
What is the Molecular weight of magnesium bicarbonate?
MgCO3 has a molar mass (molecular weight) of 84.3139 g/mol.
Does an increase in molecular weight speed up molecular movement?
no relation iz between molecular weight and movement which iz a function of temperature only.
Does low molecular weight heparin cross the placenta?
Standard heparin, an effective treatment for antepartum thromboembolic disease, is thought to be safe for the fetus since it does not cross the placenta. Recently, a number of low molecular weight heparins have been prepared which have been shown to produce less bleeding than standard heparin for an equivalent antithrombotic effect in experimental animals. These observations suggest that the low molecular weight heparins may also provide superior antithrombotic therapy in antepartum thromboembolic disease. However, it is not known whether the low molecular weight heparins cross the placenta. To determine this, we examined the pharmacokinetics of 125I-labelled standard heparin and a low molecular weight heparin, and their anticoagulant effects in mother and fetus, using a pregnant sheep model. Catheters were inserted into maternal and fetal femoral arteries at 108-119 d gestation (term: 147 d). 1-3 days later the mothers were given a bolus i.v. injection of 5000 anti-Xa units of 125I-labelled standard heparin or low molecular weight heparin, CY 222. Nine serial blood samples were collected over 4 h from both mother and fetus for measurements of radioactivity, anti-Xa activity (chromogenic) and activated partial thromboplastin times. When therapeutic levels of standard and CY 222 heparins were achieved in the mother, there was no detectable radioactivity or anticoagulant effect in the fetus. We conclude that standard heparin and the low molecular weight CY 222 do not cross the placenta in the pregnant sheep.
Definition of primary STANDARD in pharmaceuticals?
the compounds which are having high molecular weight,easiliy available,chemially stable
How do you prepare a primary standard solution of 0.0500 M sodium carbonate?
use the equation that is standard: 1000 ml 1 M solution= (MOLECULAR WEIGHT) X ml 0.05 M solution = ((MOLECULAR WEIGHT)*X*0.05)/1000
Why anhydrous sodium carbonate is a primary standard?
na2co3 is primary standard,because,molarity remains same with time,and it is of high molecular weight
What is primary standard solution?
A primary standard is a reagent that is extremely pure, stable, has no waters of hydration, and has a high molecular weight.
Why primary and secondary standard solutions are needed in analysis.?
Primary standards have some peculiar propertiesThey are nonsensitive to atmospheric oxygenThey have known formula and molecular weightThey are usually high molecular weight compoundsThey have a constant concentration /uniform composition for a long period of timeThey are powerful reactantsSecondary standards areInfluenced by atmosphere/environmentConcentration change over timeUsually powerful reactantsUsually cheap & easy to useZeryawkal Ergetie(Msc in pharmaceutical Analysis )
Why is non hygroscopic important for primary standard?
Then it is possible to measure accurately the weight of it, so you know exactly how many moles of the primary standard you have. When it would have been hygroscopic then your actual mass of the standard is lower than the measured, caused by the extra weight of water.
What is the molecular weight of chymotrypsin?
It has a molecular weight of 21,600 Daltons
What is the molecular weight and molecular formula of potassium humate?
molecular structur C9H8K2O4molecular weight: 258.35
If you have molecular weight how can you find equivalent weight?
Equivalent weight ofc11h17n3os2 from molecular weight271.402
What is the molecular weight of vanillideneacetone?
The molecular weight of vanillideneacetone is 192.214g/mol.
What is a primary standard?
A primary standard solution is generally a solution prepared and certified by an authorized and specialized institution (for example: NIST - National Institute for Standards and Technology).
What is the molecular weight of sodium nitrate?
Sodium nitrate molecular weight is 84,9947.
