The concentration of glucose in an aqueous  solution can be determined by oxidation with ferricyanide ion, Fe(CN)63–.  The absorbance of the ferricyanide ion measured at 420 nm increases as the concentration of glucose increases. [Glucose], mg / mL Absorbance 0.005 0.132 0.010 0.290 0.020 0.498 0.030 0.642 0.040 0.750 Using the method of least-squares, give the equation of the best straight line through the points. Make sure that m=slope has 3 decimal places (XX.XXX) and y-intercept (b) has 2 significant figures (0.0XX). In your answer you should write in the form of y=mx+b. For instance, y = 12.316x + 0.072

The titration below was performed by placing 10.00 mL solution in an Erlenmeyer flask and titrating it with 0.1000 M HCl. What is the concentration of the solution being titrated?   0.02500 M 0.0500 M 0.0750 M 0.100 M 0.200 M

I need help with questions 67-68. Could you also explain which option is the correct answer for each question?

Find the pH value for a solution containing 0.5 mg/L of copper ion (Cu2+) dissociated from Cu(OH)2 at equilibrium. If the pH of this solution is adjusted to 6 and 10, what would be the concentrations of copper ion in mg/L at equilibrium, respectively?

A lab is performed by students who used diagnostic tests to try to distinguish among four pure substances. Solids labelled as 1, 2, 3, and 4 were dissolved in 100 mL of distilled water in four separate beakers with each becoming a colourless solution. The results of two diagnostic tests were recorded as follows: Solution 1 2 M Result of Conductivity Test conducts conducts does not conduct conducts Result of Litmus Test no change blue turns red no change red turns blue Using the results of the diagnostic tests, select the identity for each solution. 1. Citric acid is the solution in beaker 2. Potassium hydroxide is the solution in beaker 3. Glucose is the solution in beaker 4. Calcium chloride is the solution in beaker

How do I balance the following equation? C+H2O→CO2+CO+H2

Predict which species will be oxidized and which will be reduced in a molten salt mixture that contains CdI2, NaOH, and AlCI3. Cd2+(aq)  +  2e  →  Cd(s)                                        Eored = – 0.40 V I2(s)  +  2e  →  2 I–(aq)                                            Eored = + 0.54 V Na+(aq)  +  1e  →  Na(s)                                         Eored = – 2.71 V Cl2(g)  +  2e  →  2 Cl–(aq)                                       Eored = + 1.36 V Al3+(aq)  +  3e  →  Al(s)                                          Eored = – 1.66 V O2(g)  +  2 H2O(l)  +  4e  →  4 OH–(aq)                  Eored = + 0.40 V     which is oxidized    which is reduced

What is the pH of bleach with hydronium ion concentration of 0.0879 M?

Suppose the Kc value for Cobalt (II) hexahydrate is 6.80 and suppose upon heating the solution turned pink.  If a group of student started mixed 10.5 mL of a 1.25 M [Co(H2O)6]2+(aq) solution with 12.5 mL of a 1.55 M solution of NaCl(aq) with 15.25 mL of a 1.39 M [CoCl4]-2(aq) solution then what color is the solution at equilibrium?   [Co(H2O)6]2+(aq)  +  4 Cl-(aq)      [CoCl4]-2(aq)  +  6 H2O(L)   Multiple choices   pink   purple   green   black   orange   brown   blue   colorless   yellow   gray   red   green