do you mean 100 ml? most solutions are given in terms of volume not mass. But ...
CaCl2 has a molar mass of 111 g The hydrated form also contains 108 g water. This gives a total mass of 219 g for the hydrated form.
The solution must contain: 100 g x 5% = 100 x 5/100 = 5g anhydrous CaCl2
5 / x = 111 / 219
solve for x: x = 5(219)/111 = 9.865 g of the hydrate
Exactly the same amount of salt as you weighed out to make the salt water solution in the first place.
Knowledge of your genome could help you prepare for, or even prevent, some diseases.
· Prepare half litre of N/10 HCl solution by diluting 10 ml of the concentrated acid to 1 litre. · Prepare N/10 sodium carbonate solution by weighing exactly 1.325 g of anhydrous sodium carbonate and then dissolving it in water to prepare exactly 0.25 litre of solution. · Standardize the HCl solution by titrating it against the standard sodium carbonate solution using methyl orange as indicator. · Take 20 ml of standardized HCl in the conical flask, use methyl orange as indicator and see the amount of base used for neutralization. · Powder the various sample of antacids tablets and weigh 10 mg of each. o Take 20 ml of standardized HCl solution in the conical flask; add the weighed samples to it. o Add two drops of methyl orange and warm the flask till most of the powder dissolves. Filter off the insoluble material. o Titrate the solution against the standardized Na2C03 solution till a permanent red tinge appears. o Note the amount of base used for titration and note the reduction in the amount of base used. o Repeat the experiment with different antacids.
An unknown being weighed is hygroscopic.
Yes
29 percent
Only by experiments. For example the solution is heated, water is evaporated and the salt weighed.
You weighed 190 and lost 30 so you now weigh 160. 30 divided by 190 = 0,157 so 16%
In order to prepare exactly 30 mL of 1M NaOH solution, a volumetric vessel that contains exactly 30 mL when full to a marked level will be needed. By definition, a 1 M solution contains one mole in a liter of volume, and since solutions are homogeneous, 30 mL of such a solution will require (30/1000) mole of sodium hydroxide. The molar mass of NaOH is about 40, corresponding to 1.2 grams of sodium hydroxide, which can be determined by weighing solid sodium hydroxide, dissolving the weighed amount in a volume of water less than the 30 mL capacity of the volumetric vessel, transferring this more concentrated solution into the volumetric vessel, and diluting with pure water until the 30 mL volume is contained in the vessel.
Exactly the same amount of salt as you weighed out to make the salt water solution in the first place.
Knowledge of your genome could help you prepare for, or even prevent, some diseases.
192/160 - 1 = 12/10 -1 = 1.2-1 = 0.2 = 20%
· Prepare half litre of N/10 HCl solution by diluting 10 ml of the concentrated acid to 1 litre. · Prepare N/10 sodium carbonate solution by weighing exactly 1.325 g of anhydrous sodium carbonate and then dissolving it in water to prepare exactly 0.25 litre of solution. · Standardize the HCl solution by titrating it against the standard sodium carbonate solution using methyl orange as indicator. · Take 20 ml of standardized HCl in the conical flask, use methyl orange as indicator and see the amount of base used for neutralization. · Powder the various sample of antacids tablets and weigh 10 mg of each. o Take 20 ml of standardized HCl solution in the conical flask; add the weighed samples to it. o Add two drops of methyl orange and warm the flask till most of the powder dissolves. Filter off the insoluble material. o Titrate the solution against the standardized Na2C03 solution till a permanent red tinge appears. o Note the amount of base used for titration and note the reduction in the amount of base used. o Repeat the experiment with different antacids.
1-185/205 = 0.0976 So you lost about 9.8%
The only difference is that a 0.200M solution is made more accurately the substance in this case would have to weighed out on a 3 place balance. An 0.2M would only need a 1 place balance.
The vet weighed the dog.All the bags are weighed before they are checked in at the airport.
Because NaOH is hygroscopic, meaning it absorbs water from the air, NaOH cannot be accurately weighed. To standardize 0.1 M NaOH, a solution is made to an approximate concentration of 0.1 M and then standardized by titrating an accurately weighed quantity of a primary standard.