A 377.0-mg sample of As,0, is dissolved to give two molecules of H,AsO, per one molecule of As,O, and is oxidized to H,AsO, with 31.48 mL of 0.0502M (0.1040N) iodine (I,) Calculate the percentage of As,O, (form wt = 197.84) in the sample.
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- A sample of processed meat scrap weighing 4.000 g is digested with concentrated HSO. and Hg(catalyst) until the N present has been converted to NHHSO.. This is treated with excess NaOH, and the liberated NHs is caught in a 100-ml of H.SO. ( Iml 0.01860 g Na:OJ. The excess acid requires 57.60 ml of NaOH ( ImL = 0.12660 g potassium acid phthalate, KHCaH.OJ. Calculate the percentage protein in the meat scrap 4.Example 2/ A solution was prepared by dissolving 2.45 g of AGNO3 in sufficient water to give 50 ml , for this solution calculate wt - volume % , no . mfw AgNO3 taken , formality of solution of AGNO3.The thiourea in a 1.563 g sample.of an organic material was extracted into a dilute H2SO4 solution and titrated with 36.43 mL of o.o09284 M Hg²* via the reaction below. 4(NH2)½CS + Hg2 - [(NH2),CS],Hg²• What is the percentage of (NH2)2CS (Molar Mass = 76.12 g/mol) in the sample?
- 3 Bal, (aq)+ 2 Nag POq Caq) 7 BalPO42 + l6 Nal laq • Consider the reaction of 30.0mL of 0.270M Balz with 20.0 mL of 0.3ISM Naz PO4. Lwhat quantity in meles of Balz are preset in the solution? are produced /What quantitg in moles of precipitate E ali Bal were consumed based on the balanced chomical equation? 6) What auantity in males of Na3 Pla aro present in soluction? d) What quantity in moles of precipitate are paduced if all the Naz PO, were cansumed based on the balanced chemi.cal equation? e) which reactant is limisting f What mass (in g) of precipitate is firemed when the limiting reactant is considered?The aluminum in a 1.200-g sample of impure ammonium aluminum sulfate was precipitated with aqueous ammonia as the hydrous Al2O3.xH2O. The precipitate was filtered and ignited at to give anhydrous Al2O3, which weighed 0.2001 g. Express the result of this analysis in terms of %NH4Al(So4)2 %Al2O3 %Al1. A student synthesized 3.214g of Ni(NH3)„Cl2 from 4.023g of N¡C12•6H2O. He dissolved 0.81g of Ni(NH3)nCl2 in 40 mL of 1.0M HCI to make a sample for analysis. Molar mass: Ni 58.7; Cl2 71; NH3 1T; H2O 18. (1) A 0.20M Ni²* standard solution had an absorbance of 1.666, while his sample had an absorbance of 0.705. Calculate the Ni2+ concentration in his sample and the mass percent of Ni in the product. Note: A = ɛbc. (2) The student used 38.75 mL of 0.498M NaOH to neutralize excess HCl in 40mL of the sample. Calculate the mass percent of NH3 in the product.
- 6. The phosphorus content in a 0.3004-g sample was precipitated as (NH4);PO4 .12M0O3 a slightly soluble precipitate. The precipitate was filtered, washed, and further redissolved in acid. The resulting solution was treated with an excess of Pb²* resulting in the formation of 0.3017 g of PbMoO4. Calculate the % w/w of P2Os.||A sample of processed meat scrap weighing 4.000 g is digested with concentrated H.SO. and Hg(catalyst) unti the Npresent has been converted to NHHSO.. This is treated with excess NaOH, and the liberated NHs is caught in a 100-ml of H.SO. ( Iml = 0.01860 g Na:OJ. The excess acid requires 57.60 ml of NaOH ( Iml = 0.12660 g potassium acid phthalate, KHCaH.O.j. Calculate the percentage protein in the meat scrap6. (2 pts) Aqueous solutions of a compound did not form precipitates with Cl', Br', I, SO,²', CO;²', PO4³-, OH", or S2-. This highly water-soluble compound produced the foul-smelling gas H2S when the solution was acidified with HCl (aq). This compound is A) Pb(NO3)2 B) (NH4)2S C) KBr D) Li2CO3 E) AgNO3
- A 2.663 g sample contain thiourea (NH,),CS (76.12 g/mol) was extracted into a dilute H,SO, solution and titrated with 37.88 mL of 0.006882 M Hg" according to the following reaction 4(NH2),CS+Hg [(NH),CS] Hg* Calculate the %((NH,),CS in the sample? 1. 02.981 % 2 07317 % 3. O98.45 % 4. 03.248 .8. Write the net ionic equation for cach reaction. a. K;CO;(aq) + CaCl:(aq) → CaCO;(s) + 2KCI(aq) b. Pb(NO3):(aq) + (NH,);S(aq) → 2NH,NO;(aq) + PbS(s) 2LİCI(aq) + 2Hg.(NO,)(aq) → Hg,Cl;(s) + 2LİNO;(aq) d. 2NAOH(aq) + MgCl;(aq) -AMg(OH):(s) + 2NaCl(aq) 2011 Cengage Leaning All Rights Reserves May tiet beseanned.copied.or duplicated, or posted to a publicly accessible websi Chapter 7: Reactions in A 33,765)1 Point In gravimetric determination of sulfate present in the soil, 0.2075g of sample was treated with 0.2 M barium chioride. which forms precipitate. The precipitate was then heated in the oven by keeping it in crucible. If the initial crucible weight was 3.0531g and final was 3.5016 g. What is the mass % of sulfate in the unknown sample? 89.50% 19.00% 92.01% D 90.46%