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A sample of sweet corn weighing 175 grams was freeze dried The recovered solid weighed 122 grams What was lost?
Wiki User
∙ 15y ago
53 grams of water was lost.
Wiki User
∙ 15y ago
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What is sulphated ash?
The sulphated ash test is an analytical test for determining the inorganic content of a sample by weight. The sample ( usually 1g) is accurately weighed into a platinum, silica crucible that has been previously ignited, cooled and weighed. The sample in the crucible is then subjected to sulphuric acid (usually 1mL) and charred at a low temperature without causing ignition of the sample until there are no more white fumes given off. The crucible with the charred sample is then placed in a furnace (temperature is dependent on monograph but typically it can be from 600 to 900 degrees celcius) until all organic matter has been burnt off. The crucible is cooled and re-weighed. The difference in sample weights being the sulphated ash content remaining. Some monographs require the sample to be re-ashed until a constand weight has been achieved. The remaining inorganic matter is typically metal oxides from most samples.
An alternative procedure for determining the density of a liquid would be to pipet a sample of the liquid into a weighed flask then reweigh the flask to determine the mass of liquid transferred?
Yes, pipetting the liquid into a weighed flask and then weighing it again would give you an indication of the density of the liquid. The answer would, however, not be as accurate as when you use specialized equipment for the measurement. Depending on your application this difference might or might not be significant. If you are in doubt and a hurry it could be best to do your measurement the way you described it and state your method clearly in your report. Just remember to use as big a volume as possible (eg. a 100ml pipette), to minimse the effect of possible pipetting inaccuracies (eg. parralax error, ect.).
Why is the collected soil sample dried before weighing in soil analysis?
because the hydrogen cells in the H2O will give the soil an unbalance when being wheighed because the hydrogen cells in the H2O will give the soil an unbalance when being wheighed
What properties could be used to help determine whether the sample is rreally zinc?
Melting point of the sample & Density of the sample
What is the concentration of carbon dioxide in this sample?
well when the heart pumps then its the sample
Sample A weighed 3 ounces Sample B weighed 814 thousandths of an ounce more than Sample A What decimal should you use to record the weight of Sample B?
.00814
Would the reported molarity of the vinegar sample be affected by an error in weighing?
Yes, you could possibly have errors in your data about the molarity of a vinegar sample during a titration experiment if there was an error made during weighing.
How is fat content determined by soxhlet method?
The Soxhlet method for determining crude fat content is a lengthy process requiring up to a day for a single analysis. The solvent extraction step alone takes six hours. The method is therefore not favoured for routine testing purposes in the meat industry, rather it is used as a standard reference method. As well as being used to determine the fat content of meat and meat products, the Soxhlet method can be used to determine the fat content of meat meal. In the case of meat meal, the Soxhlet method is often the method of choice as a routine test. Crude fat content is determined by extracting the fat from the sample using a solvent, then determining the weight of the fat recovered. The sample is contained in a porous thimble that allows the solvent to completely cover the sample. The thimble is contained in an extraction apparatus that enables the solvent to be recycled over and over again. This extends the contact time between the solvent and the sample and allows it time to dissolve all of the fat contained in the sample. In order for the solvent to thoroughly penetrate the sample it is necessary for the sample to be as finely comminuted as possible. Before the solvent extraction step can begin the sample must be dried. Often a moisture analysis is required as well as a fat analysis and this can be achieved by accurately weighting the sample after drying and before extraction, as well as before drying. If a moisture analysis is not required the sample need only be weighed before drying and again after solvent extraction. In either case the sample must be weighed accurately on an analytical balance at each stage of the analysis. When the sample is being weighed it is important not loose any part of it including any moisture that may weep from the sample during weighting. Loss of this moisture can be avoided by weighing the sample directly into a pre-dried extraction thimble or alternatively on to a pre-dried filter paper. If a moisture analysis is required, the dried extraction thimble or filter paper also has to be pre-weighed. After weighing, the sample (in the thimble or filter paper) can be placed in the oven for drying. After drying, the sample can be placed directly into the distillation apparatus for extraction.
What are the uses of a weighing boat?
A weighing boat is an open container often used in chemistry and biochemisrty. It is used if you want to weigh a sample very accurately.
What will prevent you from contaminating another students sample?
Using weighing paper to measure solids
A sample of the compound prepared in this experiment weighing 0.1021 g is dissolved in HNO?
This is not a question.
How many moles of tantalum atoms are in a sample weighing 90.45 g?
0.5 moles.
How do you find the mass of water lost in hydrate?
By weighing the sample before and after heating to dehydration.
A 15.7g sample of sodium carbonate is added to a solution of acetic acid weighing 18.9 g and after reaction weighing 26.3g what is mass of carbon dioxide?
8.7g
Why must the weighing scoop be washed when transferring the sample into the conical flask?
Your intention is to transfer only the true sample into the conical flask, not the dirt from the scoop.
What actions will prevent you from contaminating another student's sample?
Using weighing paper to measure solids
How can you get the molar mass of insulin knowing just the grams of insulin in a sample and the number of molecules that that sample contains?
by weighing out the bit of insulin that you want to find how much of it there is
