Consider a mixture of the two solids BaCl2.2H2O (FM 244.26) and KCI (FM 74.551). When the...
A sample containing a mixture of SrCl2·6H2O (MW = 266.62 g/mol) and CsCl (MW = 168.36 g/mol) originally weighs 1.9715 g. Upon heating the sample to 320 °C, the waters of hydration are driven off SrCl2·6H2O, leaving the anhydrous SrCl2. After cooling the sample in a desiccator, it has a mass of 1.6811 g. Calculate the weight percent of Sr, Cs, and Cl in the original sample. 1) wt% Sr 2) wt% Cs 3) wt% Cl
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Please Danate EXPERIMENT 6 ther Water in Hydrates MATERIALS AND EQUIPMENT Golids: finely ground eopper I) sulfate pentahydrate (Cuso, 5H,0), and unknown hydrate Cobalt chloride test paper, clay triangle, erucible and cover, 25x 200 mm ignition test tube, watch glass DISCUSSION any salts form compounds in which a definite number of moles of water are combined with each mole of the anhydrous salt. Such compounds are called hydrates. The water which is ther two ane...
A mixture of Cu(NO3)2 and Cu(NO3)2.2.5H20 has a mass of 3.150 g. Upon heating the water is driven off and the mass of the Cu(NO3)2 is 2.853 g. Determine the % by weight of the Cu(NO3)2.2.5H20 in the original mixture.
SEPARATION OF A MIXTURE OF SOLIDS 4. Define the terms "sublimation" and "decantation." 5. Consider that you started with a 3.506 g sample of a mixture containing NH,CI, NaCI, and Sio, and sublimed away 0.750 g of NH·CL when you removed all of Naci by dissolving in water, 1.284 g of SiO2 was present in the evaporating dish. What was the mass percentage of NaCl in the mixture? Show all work.
A 2.31 g sample of a mixture of AgNO3 and NaNO3 is treated with excess Na2S(aq). The precipitate is filtered off, dried and weighed. The dried precipitate weighs 0.47 g. What is the percentage by mass of NaNO3 in the original mixture? Your answer must be accurate to two significant digits. Keep several extra digits in your calculations and round off only at the end. Do not include the percent sign (%) as part of your answer! Molar masses (in...
A 0.6689 g mixture of KCN (MW = 65.116 g/mol) and NaCN (MW = 49.005 g/mol) was dissolved in water. AgNO, was added to the solution, precipitating all of the CN in solution as AgCN (MW = 133.886 g/mol). The dried precipitate weighed 1.518 g. Calculate the weight percent of KCN and NaCN in the original sample. KCN wt% = NaCN wt% =
A 0.5427 g mixture of KCN (MW=65.116 g/mol) and NaCN (MW=49.005 g/mol) was dissolved in water. AgNO3 was added to the solution, precipitating all of the CN− in solution as AgCN (MW=133.886 g/mol). The dried precipitate weighed 1.264 g. Calculate the weight percent of KCN and NaCN in the original sample. KCN wt%= % NaCN wt%=
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Experiment #7 Pre-Lab Assignment Hint: for full credit, show all calculations, use proper sig. figs. and units Name Stoichiometric Analysis of a Mixture Lab Instructor Lab time Thurs. Tues. Lab Day Mon. An unknown mixture containing KCIO) was added to an ignition tube weighing 41.860 g. The tube and mixture was then found to weigh 43.772 q. After the first heating, the tube and its contents weighed 43.621 g. After the second and third heatings, it weighed 43.332 g....
Question 2,3,4 please.
ESTIONS: 1. Many students do not recover 100% of the original mixture. Describe at least two possible problems that could cause less than 100% recovery of the mixture. 2. A student received a mixture that actually contained 50.0% salt and 50.0% sand. At the end of the experiment, this student calculated that his sample was composed of 45.2% salt and 54.8% sand. What might he have done (or not done correctly) during the experiment to cause this...
Need to find percent by mass of K and Cl combined in KClO3 and
the rest. thanks!
there is no information about AgCl
SAFETY PRECAUTIONS BEYOND STANDARD PROCEDURES CAUTION! Potassium chlorate is a strong oxidizing agent and may cause fires or explosions if mixed or heated with combustible materials. Observe the following safety precautions when working with potassium chlorate. Heat samples slowly and carefully to avoid spills and spattering. Check before disposing of potassium chlorate residue. Dispose of solutions containing...