HW 4

Calcium ions contribute to the hardness of water.  a) Based on the Ksp experiment, describe a way to “soften” water by removing calcium ions.  b) what would be the advantages and disadvantages of this method?

1. Write a chemical reaction that describes formation of the silver image in black and white photography.

Potentially Useful Information Spectrochemical Series: I < Br < SCN° < Cl° < NO3¯ < F < OH° < C2O4²-~ H2O < NCS < NH3 < en < PPH3 A student has three test tubes containing a metal (M) nitrate solution M(NO3)2 (aq) (where "M" represents a generic transition metal). The student adds aqueous ammonia (NH3) to one test tube, aqueous hydrochloric acid (HCI) to the second tube, and nothing more to the third tube, but forgets to label the tubes. After this, one test tube contains a red solution, one an orange solution, and one a yellow solution. Note: This metal, M, would follow the same rules that we used for Cu(II), Ni(II), and Co(II). The Jahn-Teller Effect does not apply. Complete each statement or answer each question below about the solutions in the three test tubes. The coordination complex causing the orange solution causes a larger splitting between the d orbitals of the metal then the coordination complex causing the... O red solution. O yellow solution. What color light does the…

Potentially Useful Information Spectrochemical Series: I < Br < SCN < Cl° < NO3¯ < F° < OH° < C2O4² ~ H2O < NCS" < NH3 < en < PPH3 A student has three test tubes containing a metal (M) nitrate solution M(NO3)2 (aq) (where "M" represents a generic transition metal). The student adds aqueous ammonia (NH3) to one test tube, aqueous hydrochloric acid (HCI) to the second tube, and nothing more to the third tube, but forgets to label the tubes. After this, one test tube contains a red solution, one an orange solution, and one a yellow solution. Note: This metal, M, would follow the same rules that we used for Cu(II), Ni(II), and Co(II). The Jahn-Teller Effect does not apply. Complete each statement or answer each question below about the solutions in the three test tubes. The red solution contains a coordination complex with... O ammonia (NH3) as the ligand. chloride ion (CI') as the ligand. nitrate ion (N03°) as the ligand. water (H20) as the ligand.

Potentially Useful Information Spectrochemical Series: I < Br < SCN < Cl` < NO3¯ < F° < OH° < C2O4² ~ H2O < NCS“ < NH3 < en < PPH3 A student has three test tubes containing a metal (M) nitrate solution M(NO3)2 (aq) (where "M" represents a generic transition metal). The student adds aqueous ammonia (NH3) to one test tube, aqueous hydrochloric acid (HCI) to the second tube, and nothing more to the third tube, but forgets to label the tubes. After this, one test tube contains a red solution, one an orange solution, and one a yellow solution. Note: This metal, M, would follow the same rules that we used for Cu(II), Ni(II), and Co(II). The Jahn-Teller Effect does not apply. Complete each statement or answer each question below about the solutions in the three test tubes. The coordination complex formed by adding HCI to the metal solution has a coordination number of... O 3 2

* OWLv2 | Online teaching and lea X .cengagenow.com/ilm/takeAssignment/takeCovalentActivity.do?locator=assignment-take 1 pts M) Use the References to access important values if needed for this question. A student weighs out a 9.95 g sample of BaBr2, transfers it to a 250. mL volumetric flask, adds e water to dissolve it and then adds water to the 250. mL tick mark. 1 pts 2reg What is the molarity of barium bromide in the resulting solution? Molarity M 1pts 2reg Submit Answer Retry Entire Group 6 more group attempts remaining -V. 1 pts 2reg pts 2req 1 pts 2req 1 pts 1 pts 2req ates 1 pts 2req 1 pts M) 1 pts 40

Potentially Useful Information Spectrochemical Series: | < Br < SCN¯ < Cl° < NO3¯ < F° < OH° < C2O4²¯ ~ H2O < NCS° < NH3 < en < PPH3 く A student has three test tubes containing a metal (M) nitrate solution M(NO3)2 (aq) (where "M" represents a generic transition metal). The student adds aqueous ammonia (NH3) to one test tube, aqueous hydrochloric acid (HCI) to the second tube, and nothing more to the third tube, but forgets to label the tubes. After this, one test tube contains a red solution, one an orange solution, and one a yellow solution. Note: This metal, M, would follow the same rules that we used for Cu(II), Ni(II), and Co(II). The Jahn-Teller Effect does not apply. Complete each statement or answer each question below about the solutions in the three test tubes. The aqua complex causes less splitting of the d orbitals of the metal than the... ammonia complex. O chloro complex.

May you explain this for me please?

rofiles X Ave X 14 X nt/takeCovalentActivity.do?locator assignment-take 30 Tab Window Help Quiz 5.pdf F3 Submit Answer OWI X 54 $ R a [Review Topics] [References] Use the References to access important values if needed for this question. Potassium hydrogen phthalate is a solid, monoprotic acid frequently used in the laboratory to standardize strong base solutions. It has the unwieldy formula of KHC, H4O4. This is often written in shorthand notation as KHP. What volume of a 0.182 M calcium hydroxide solution is needed to exactly neutralize 2.27 grams of KHP? Volume = mL F4 OCT 12 Para X % Math 122 Quiz 5.docx 5 Retry Entire Group tv T 9 F5 8 . We Show All 4) F12 1 X delete

The spectroscopic data in the table is generated with five solutions of known concentration. Concentration (M) 0.0179 0.0358 0.0716 0.143 0.286 Absorbance 0.1425 0.1896 0.5722 1.126 2.110

To make this KNOWN solution, 0.1632 g was mixed with water (to the mark) in a 100.mL volumetric flask. The Absorbance of this solution was = 0.901 The Unknown Compound (K2Zy(C2O4)z . nH2O) was used to make another solution: 0.1016 g of the unknown compound was mixed with water (to the mark) in a 100.mL volumetric flask. The Absorbance was = 0.677 1a.) Find the molarity of Z, in the ZSO4 . 3H2O (known) solution.(Z is, again, this fictional metal, with molar mass 87.91 g/mol.)Remember that molarity is moles per liter. 1b.)Find the molarity of Z in the unknown solution using Beer’s Law 1c.)Using your answer, find the moles and then the mass of Z in the unknown solution. 1d.) Find the % Z (by mass) in the unknown compound.

1. It is assumed for the calibration solutions that all of the SCN is converted to FESCN2*. What would happen to the calculated Keq if this assumption were incorrect? 2. A student mixes 5.00 mL of 2.00 mM iron (III) nitrate with 5.00 mL of 2.00 mM sodium thiocyanate. The student determines that the concentration of FeSCN2* is 1.05x104 M. Calculate Keg-

The 9th element for this tierlist is hydrogen. The simulated experiments only confused me.

List the metals you used in order from most reactive to least reactive. Explain your reasoning.

For each, write the chemical equation for its dissociation in water: a. Co(NO3)2 b. Cu(NO3)2 + 1 Ni(NO3)2 Hint: All three are ionic compounds that follow the principle described in this video: https://www.youtube.com/watch?v=ZOGEKX7OJHS What must account for the different colors? C.

1. There are 2 possible ways for CuBr₂ to release Br₂: i) CuBr₂ → CuBr + 1/2 Br₂ or ii) CuBr₂ → Cu + Br₂ Look up the colors for CuBr₂, CuBr, and Cu. Based on your observations in the lab, explain which chemical equation best describes how Br₂ is formed in this experiment.

Please see attached photo and answer question in photo, for #39. Thanks!

H2X2O3 is a weak acid. What is [X2O32–] in a 0.44 M  H2X2O3 solution?   A. 1.1 x 10–7 M   B. 0.60 M   C. 7.1 x 10–7 M   D. 1.5 x 10–5 M   E. 7.1 x 10–11 M   F. 0.11 M   G. 1.1 x 10–11 M [Ka1 = 1.1 x 10–7;  K a2 = 7.1 x 10–11]

Write the chemical formula for iron(III) chloride hexahydrate O4- 2+ 3+ 4+ 1 3 4 6. 7 8 9. O2 O3 04 O8 O9 (s) (1) (g) (aq) + H. Ch Ir CI CIO, Fe CIO CIO, Reset • x æ H¸O Delete + + 11 2. 3.

okmarks People Tab Window Help OWLV2 | Online teaching and Ix t.cengagenow.com/ilrn/takeAssignment/takeCovalentActivity.do?locator=Dassignment-take&takeAssignmentSess [Reforonces] Copper metal reacts with nitric acid. Assume that the reaction is 3Cu(s) + 8HNO3(aq)3Cu(NO3)2 (aq) + 2NO(g) + 4H2O(1) If 5.17 g Cu(NO3)2 is èventually obtained, how many grams of nitrogen monoxide, NO, would have formed? ot Submlt Answer Try AnotherVerelon 6 item attempts remaining pt pt pt I pt 1 pt 1 pt 1 pt 1 pt 1 pt 1 pt 1 pt ent MAR 15