5/21/2023 0 Comments Ammonium sulfide mmassAdd about 50 mL of deionised water to the beaker and stir to dissolve all the ammonium sulfate in the lawn fertiliser.M(fertiliser) in grams = m(fertiliser + beaker) - m(beaker) Record the mass of lawn fertiliser and beaker:Ĭalculate the mass in grams of fertiliser in the beaker: Transfer about 1 g of the powdered lawn fertiliser to the beaker and weigh.Accurately weigh a 100 mL clean, dry, glass beaker.The smaller the particles, the faster and more completely they will dissolve in a solvent. Using a clean mortar and pestle, grind up about 1.5 g of lawn fertiliser up into fine powder.Which then allows us to calculate the percentage by mass of sulfate in the lawn fertiliser: So, we can calculate the mass of sulfate ions in grams in the sample of lawn fertiliser: M(BaSO 4(s)) = 137.3 + 32.06 + 4 × 16.00 = 233.36 g mol -1įrom the balanced chemical equation above, we can see that 1 mole of BaSO 4(s) is produced from 1 mole of SO 4 2- (aq), so,Īssuming the ONLY source 4 of sulfate ions was the original lawn fertiliser sample, we now know the moles of SO 4 2- (aq) in our sample of lawn fertiliser. Use the Periodic Table to find the molar mass, M, of each element: N(BaSO 4(s)) = mass(BaSO 4(s)) ÷ molar mass(BaSO 4(s)) We weigh the barium sulfate precipitate and calculate the moles of BaSO 4(s), n(BaSO 4(s)): ( Solubility rules tell us that all sulfates are soluble except those of barium, strontium, calcium, silver, mercury(I) and lead, that is, barium sulfate is insoluble in water) Next we add an excess of barium ions, Ba 2+ (aq), to precipitate out barium sulfate, BaSO 4(s) ( Solubility rules tell us all ammonium salts are soluble in water) Then we dissolve the sample in water producing an aqueous solution containing ammonium ions, NH 4 + (aq), and sulfate ions, SO 4 2- (aq). The lawn fertiliser (lawn food) to be analysed contains ammonium sulfate, (NH 4) 2SO 4.įirst we take a sample of lawn fertiliser, weigh it and record its mass in grams: No ads = no money for us = no free stuff for you! Theory The amount of sulfate in the lawn fertiliser is expressed as a percent by mass ( w/w %).(iii) mass of sulfate ion, SO 4 2-, present in the lawn fertiliser. (ii) moles of sulfate ion, SO 4 2-, present The mass of barium sulfate precipitated is used to calculate:.Gravimetric analysis can be used to determine the amount of sulfate present in lawn fertiliser (lawn food) by precipitation of the sulfate as insoluble barium sulfate 3, BaSO 4 Ba 2+ (aq) + SO 4 2- (aq) → BaSO 4(s).Lawn fertilisers (also known as lawn food) usually contain water soluble ammonium sulfate 2, (NH 4) 2SO 4.Gravimetric analysis is the quantitative isolation of a substance by precipitation and weighing of the precipitate.You need to become an AUS-e-TUTE Member! Sulfate in Lawn Fertiliser Gravimetric Analysis Key Concepts Want chemistry games, drills, tests and more? Sulfate in Lawn Fertiliser Gravimetric Analysis Tutorial More Free Tutorials Become a Member Members Log‐in Contact Us
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