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- STANDARDIZE THE Na,S;Os.SH2O WITH KIO. Weight of KIO, = 0.5325 g V ot KIO, =250 ml N KIO, V KIOL ml 7.0 7.0 VNas:O1.5H:0, ml 8.2 7.5 N NasO.5H;0 Averoge N Nars:O,.5H;OGold can be determined in solutions containing high concentrations of diverse ions by ICP-AES. Aliquots of 50.0 mL of the sample solution were transferred to each of four 100.0 mL volumetric flasks. A solution was prepared containing 10.0 mg/L Au in 20% H2SO4 and quantities of this solution were added to the sample solutions to give 0, 2.5, 5, and 10 mg/L added Au in each of the flasks. The solutions were made up to a total volume of 100.0 mL, mixed, and analysed by ICP-AES. The resulting data are presented in the following table. Added Au, mg/L Emission Intensity Count 12,568 19,324 26,622 40,021 0.0 2.5 5.0 10.0 Calculate the concentration of gold in the original sample.Gold can be determined in solutions containing high concentrations of diverse ions by ICP. Aliquots of 50.0 mL of the sample solution were transferred to each of four 100.0 mL volumetric flasks. A solution was prepared containing 10.0 mg/L Au in 20% H2SO4, and quantities of this solutions were added to the sample solution to give 0, 2.5, 5 and 10 mg/L added Au in each of the flask. The solutions were made up to a total volume of 100.0 mL, mixed and analyzed by ICP. The resulting data are presented in the following table: Added Au (mg/L) Emission Intensity (Counts) 0.0 12568 2.5 19324 5.0 26622 10.0 40021 a) Attach an excel graph for the determination showing the X intercept. b) Calculate the concentration of gold in the sample, report with its uncertainty. c) The known concentration of gold in the sample is 8.51 mg/L. Test the hypothesis that your result is equal to this value at the 95% confidence level. l
- logi *(X Con (110 M Inb Doc (10 D (10 Doc M You 88 Nex Luk0 Mic tOP m/ilrn/takeAssignment/takeCovalentActivity.do?locator=assignment-take erosoft Office Ho... Imported From Fire... G3 Google Drive GK3 G1-Google Drve New Guiding Cours... SL What did you do la.. [References] A 2.66-g sample of a pure compound, with formula MSO̟, was dissolved in water and treated with an excess of aqueous calcium chloride, resulting in the precipitation of all the sulfate ions as calcium sulfate. The precipitate was collected, dried, and found to weigh 1.36 g. Determine the atomic mass of M, and identify M. Atomic mass = Element M: Try Another Version 3 item attempts remaining Submit AnswerA 0.4740-g pesticide sample was decomposed by wet ashing and then diluted to 200.0 mL in a volumetric flask. The analysis was completed by treating aliquots of this solution as indicated. Calculate the percentage of copper in the sample.OneLogin ALEKS - Kayley Valentine b nickel (II) sulfate cation and ani x Lea x + A www-awu.aleks.com/alekscgi/x/Isl.exe/1o_u-IgNslkr7j8P3jH-IBI5ahvJxLWwcNXdqGDInlqlcnbb-P21X0OTA0ITA3YJ_7HPrxSXe3aRFsU.. Apps O R Prechecks: Test 2... O ATOMS, IONS AND MOLECULES Deducing the ions in a polyatomic ionic compound from its empir... Complete the table below by writing the symbols for the cation and anion that make up each ionic compound. The first row has been completed for you. ionic compound cation anion NaCl CI Na NiSO, V Cl, Cro, Fe (OH), Explanation Check O 2020 McGraw-Hill Education. All Rights Reserved. Terms of Use l Pr MaćBook Pro esc 888 F4 F1 F5 F6 F7 F8 F9 F10 F11 F12 24 & Q т H. alt olt tion command command optic * 00
- Answ G A 20 Ansv My C C Write C The I C Whe Ament/tokeCovalentActivity.do?locator=Dassignment-take 身 C [Review Topics) [References] Use the References to access important values if needed for this question. The volume of water needed to dissolve 0.0691 grams of calcium chromate is Assume no volume change upon addition of the solid. Submit Answer Retry Entire Group No more group attempts remain Previous Next ENG 令 口 US 5/ Home End Insert 7 8. 9. * COMy Home * OWLV2 | Online teaching and lea x a cvg.cengagenów.com/ilm/takeAssignment/takeCXPCompliantActivity.do?locator=assignment-take Sa 9- CHEMICAL QUANTITIES Study Pr O Previous Page 8 of 16 Next O Subni Silicon carbide, SiC, is one of the hardest materials known. Surpassed in hardness only by diamond, it is sometimes known commercially as carborundum. Silicon carbide is used primarily as an abrasive for sandpaper and is manufactured by heating common sand (silicon dioxide, SiO2) with carbon in a furnace. SiO2 (s) + C(s) + CO(g) + SiC(s) What mass of silicon carbide should result when 4.3 kg of pure sand is heated with an excess of carbon? Mass = kg Save and Er Cengage Learning | Cengage Technical Support https://als-anp.cengage.info/als-asp/take P Type here to search 1243 PM 4/24/2021Labste takeCovalentActivity.do?locator ...pdf S 4 Micros OW X Submit Answer R a F4 OCT 13 % 5 Use the table on the information page to predict if a reaction will occur when Ni (s) and hydrochloric acid (aq) are combined. If a reaction occurs, write a balanced equation for the reaction. tv T PR 2022-10-11 16-09.pdf ^ K assignment-take Retry Entire Group . S A F5 <6 Paraph: A very [Review Topics] [References] Use the References to access important values if needed for this question. Be sure to specify states such as (aq) or (s). If a box is not needed leave it blank. If no reaction occurs leave all boxes blank and click on "submit". s Y + MacBook Air F6 New ko 4 Bio 103 Quiz 2.pdf NTZA O 8 more group attempts remaining & 7 U F7 - * 8 A One So ► 11 F8 W- ( 9 SVA _Homework 8 (1).docx ▶ Aa Literary + F9 O ) 0 A A Gramm Gse the F10 P Previous F11 { + 11 ▲ C|Chegr 0 Next Show All F12 Th }
- 56EF3A79haQqAAmRHdBhZQvrwNmdPsuA4 Ing and Conditions Subject Test pard Note: - You are attempting question 5 out of 12 To find the Ce content of a solid, 4.37 g were dissolved and treated with excess iodate to precipitate Ce (IO,),. The precipitate was collected, washed well, dried, and ignited to produce 0.104 g of CeO, (FM: 172.114). What was the weight percent of Ce in the original solid? (A) 1.84% (B) 1.49% (C) 1.94% (D) 1.74% Answer A B Submit P Type here to search 王 立e teaching and lear X + /ilrn/takeAssignment/takeCovalentActivity.do?locator=assignment-... 2 [Review Topics] [References] Use the References to access important values if needed for this question. In the laboratory you dissolve 13.0 g of aluminum chloride in a volumetric flask and add water to a total volume of 125 mL. What is the molarity of the solution? What is the concentration of the aluminum cation? M. What is the concentration of the chloride anion? M. Retry Entire Group Submit Answer 7 more group attempts remaining M. Previous Next H d Exit 0 x S :(d) 3-13. Distis me Jum 4 A method of analysis yields weights for gold that are low by 0.4 mg. Calculate the caused by this uncertainty if the weight of gold in the sample is (a) 900 mg. (c) 150 mg. 1-7. The method described in Problem 3-6 is to be used for the analysis of ores that assay about 1.2% gold. What minimum sample weight should be taken if the relative error resulting from a 0.4-mg loss is not to exceed -0.2%? percent relative error (a) (b) (b) 600 mg. (d) 30 mg. 3-14. Wha stan stam 3-15. Сог mea (b) -0.5%? (a) -0.8%? (c) (d) 1.2%? 3.5 3-8. The color change of a chemical indicator requires an overtitration of 0.04 mL. Calculate the percent relative error if the total volume of titrant is (a) 50.00 mL. (c) 25.0 mL. 3-9. A loss of 0.4 mg of Zn occurs in the course of an analysis to determine that element. Calculate the per- cent relative error due to this loss if the weight of Zn in the sample is (a) 40 mg. (c) 400 mg. 3.1 3.1 (b) 10.0 mL. 3.3 2.5 (d) 40.0 mL. Fo (a (E (b) 175…
