- What Is The Minimum Current That Must Be Used In The Down S Cell To Obtain 1 Kg Of Sodium Atomic Mass 23 That Can Be I 1 (15.21 KiB) Viewed 20 times
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Mg2+ (aq) + 2e = 2e = Mg(s) Cu²+ (aq) + 2e = Cu (s) -2.37V +0.34V Calculate the cell voltage for the cell below when Cu²+ (aq) is 2.0M and Mg²+ (aq) is 1.0M. Cu (s) + Mg²+ (aq) Answer: Mg(s) + Cu²+ (aq) Insert your response as a numerical value to 2 decimal places. Include a sign. Do NOT include a space between the sign and the value. DO NOT include units. e.g. -0.21
Using standard electrode potentials below: Mg2+ (aq) + 2e = Mg(s) -2.37V Cu²+ (aq) + 2e = Cu(s) +0.34V Calculate the standard cell voltage for the cell in which the following reaction occurs: Cu (s) + Mg²+ (aq) Mg(s) + Cu²+ (aq) Insert your response as a numerical value to 2 decimal places. Include a sign. Do NOT include a space between the sign and the value. DO NOT include units. e.g. -0.21 Answer:
Use standard electrode potentials below. Cd²+ + 2e -0.40 V Cd (s) Zn²+ (aq) + 2e = Zn(s) -0.76V Calculate the standard cell voltage for the cell in which the following reaction occurs: Zn (s) + Cd²+ (aq) Answer: Cd(s) + Zn²+ (aq) Insert your response as a numerical value to 2 decimal places. Include a sign. Do NOT include a space between the sign and the value. DO NOT include units. e.g. -0.21
What is the pH of a buffer that has equal volumes of 0.2 moldm³ boric acid and 0.25 moldm³ potassium borate? (Ka for boric acid = 5.8 x 10-¹0) Report your answer to 2 decimal places. DO NOT include units. Answer: What volume of sodium ethanoate is needed to prepare 500 cm³ of a buffer that has a pH of 4.5? (pKa of ethanoic acid is 4.75). Assume that the solutions of acid and conjugate base have the same concentration. Report your answer as a whole number in cm³ but DO NOT include units. Answer: