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Molarity of the HCl solution: Temperature (°C) Temperature (K) Final Buret Reading Initial Buret Reading mL of HCI Solution mmole HCI mmole tetraborate [B4O5(OH)42-] Trial 1 1.0M 22°C 295.15 K 2.2mL O ML Trial 2 39°C 312.15% K 3.7ml OML 3.7ml 2.2ML 2.2 mmole 3.7 mmole

Molarity of the HCl solution: Temperature (°C) Temperature (K) Final Buret Reading Initial Buret Reading mL of HCI Solution mmole HCI mmole tetraborate [B4O5(OH)42-] Trial 1 1.0M 22°C 295.15 K 2.2mL O ML Trial 2 39°C 312.15% K 3.7ml OML 3.7ml 2.2ML 2.2 mmole 3.7 mmole

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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how do you find mmole of tetraborate and [B4O5(OH)4^2-] for trial 1?

Background: Borax, or sodium tetraborate (Na2B4O5(OH)4), is used in many laundry products to aid in the cleaning of clothes. There are even some commercial products that are exclusively borax on the market which are sold as laundry aids. Borax is water soluble, but its solubility varies markedly with temperature. At room temperature, borax is somewhat soluble. We can write the solubility equilibrium and the solubility product constant for borax as shown below. 10 vilgu 10 QUUiO? ARGINE DE 300 Soms Jerutnb s wensqaror or browar Na2B4O5(OH)4(s) = 2Nat(aq) + B4O5(OH)4² (aq) Jor Ksp = [Na+]²[B4O5(OH)4²] seoda gninistros essed Jm 021's souff If we have a solution that is saturated with borax, the concentration of the tetraborate anion can be determined by titration with a solution of hydrochloric acid resulting in the formation of boric acid. ish Eton orit to virtploor arts broc B4O5(OH)42 + 2H+ + 3H₂O → 4H3BO3 Each mole of the tetraborate ion requires two moles of hydrochloric acid to react completely with it. If the concentration of the tetraborate ion is known, the concentration of sodium ion is equal to two times the concentration of the tetraborate; assuming that both ions in solution come only from the dissolution of borax. In this lab you will use the titration with HCl to determine the Ksp values for borax over a series of different temperatures. This data will then be used to determine different thermodynamic values at 15kn svacinasup for the dissolution reaction of borax. sdr sau alesii 96 978 LOV ISTEM Dextrosb AVER 02600 M. We have learned several equations that can be used to calculate the Gibbs' Free Energy cousig blos odi Trw Jasino di am00 2001uioz (AG) for a reaction. naamilys botenbuste bloo od firw left toyspinsho Im 02s motoni boras sc or abbon AG=AH-TAS M. denyinsha um 025 N ΟΙ ΔΗ Stuntineup 21 sleeftsysanhid or otni zarod or lo AG = -RT(InK) 10 vominottel odio 1918w besinoret dguons bb A ovato) od's em ou Jari ods If we combine these two equations, we get: AH – TAS = -RT(lnK). sijo jo esibni seneto tvrtarão aqib bbA This equation can be rearranged to give:bdayi Inioq surtolaviups ST JOH or amb 100% no en 15ud gribue bus granule brone AH-TAS InK= = m gniz quotvorą sili Hoy Sweet or lessi un 6-2 zqp12188qc 1 (e -RT eruar 2016togeista 18 noiuloa od bats unse esfc frestur er usr olunteqoist a 80/2801 which rearranges further to give: jab sar no sieb woy lin biogsi goy na odev Jorg AS woy 101 outav I sat stalinis) (0) ΔΗ or lnk= A+AS R 1 to folos< oriabron Jugriebeng & Quo steb qoy to The boxed form of the equation suggests that if we determine the values of Ksp for borax 14 moi.24 ba over a series of temperatures and then make a plot of InK sp vs. we will get a straight T' lnk= -AH AS + RT R -ΔΗ R Vsat = 5,0 mL line whose slope is and whose intercept is AS R
Transcribed Image Text:Background: Borax, or sodium tetraborate (Na2B4O5(OH)4), is used in many laundry products to aid in the cleaning of clothes. There are even some commercial products that are exclusively borax on the market which are sold as laundry aids. Borax is water soluble, but its solubility varies markedly with temperature. At room temperature, borax is somewhat soluble. We can write the solubility equilibrium and the solubility product constant for borax as shown below. 10 vilgu 10 QUUiO? ARGINE DE 300 Soms Jerutnb s wensqaror or browar Na2B4O5(OH)4(s) = 2Nat(aq) + B4O5(OH)4² (aq) Jor Ksp = [Na+]²[B4O5(OH)4²] seoda gninistros essed Jm 021's souff If we have a solution that is saturated with borax, the concentration of the tetraborate anion can be determined by titration with a solution of hydrochloric acid resulting in the formation of boric acid. ish Eton orit to virtploor arts broc B4O5(OH)42 + 2H+ + 3H₂O → 4H3BO3 Each mole of the tetraborate ion requires two moles of hydrochloric acid to react completely with it. If the concentration of the tetraborate ion is known, the concentration of sodium ion is equal to two times the concentration of the tetraborate; assuming that both ions in solution come only from the dissolution of borax. In this lab you will use the titration with HCl to determine the Ksp values for borax over a series of different temperatures. This data will then be used to determine different thermodynamic values at 15kn svacinasup for the dissolution reaction of borax. sdr sau alesii 96 978 LOV ISTEM Dextrosb AVER 02600 M. We have learned several equations that can be used to calculate the Gibbs' Free Energy cousig blos odi Trw Jasino di am00 2001uioz (AG) for a reaction. naamilys botenbuste bloo od firw left toyspinsho Im 02s motoni boras sc or abbon AG=AH-TAS M. denyinsha um 025 N ΟΙ ΔΗ Stuntineup 21 sleeftsysanhid or otni zarod or lo AG = -RT(InK) 10 vominottel odio 1918w besinoret dguons bb A ovato) od's em ou Jari ods If we combine these two equations, we get: AH – TAS = -RT(lnK). sijo jo esibni seneto tvrtarão aqib bbA This equation can be rearranged to give:bdayi Inioq surtolaviups ST JOH or amb 100% no en 15ud gribue bus granule brone AH-TAS InK= = m gniz quotvorą sili Hoy Sweet or lessi un 6-2 zqp12188qc 1 (e -RT eruar 2016togeista 18 noiuloa od bats unse esfc frestur er usr olunteqoist a 80/2801 which rearranges further to give: jab sar no sieb woy lin biogsi goy na odev Jorg AS woy 101 outav I sat stalinis) (0) ΔΗ or lnk= A+AS R 1 to folos< oriabron Jugriebeng & Quo steb qoy to The boxed form of the equation suggests that if we determine the values of Ksp for borax 14 moi.24 ba over a series of temperatures and then make a plot of InK sp vs. we will get a straight T' lnk= -AH AS + RT R -ΔΗ R Vsat = 5,0 mL line whose slope is and whose intercept is AS R
Molarity of the HCl solution: Temperature (°C) Temperature (K) Final Buret Reading Initial Buret Reading mL of HCI Solution mmole HCI mmole tetraborate [B4O5(OH)42-] Trial 1 1.0M Trial 2 22°C 39°C 0 295.15 K 312.15% 2.2mL 3.7mL 0 ML OmL 2.2mL 3.7ml 2.2 mmole 3.7 mmole
Transcribed Image Text:Molarity of the HCl solution: Temperature (°C) Temperature (K) Final Buret Reading Initial Buret Reading mL of HCI Solution mmole HCI mmole tetraborate [B4O5(OH)42-] Trial 1 1.0M Trial 2 22°C 39°C 0 295.15 K 312.15% 2.2mL 3.7mL 0 ML OmL 2.2mL 3.7ml 2.2 mmole 3.7 mmole
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