**Experiment 35 Report Sheet** **Spectrophotometric Metal Ion Analysis** **Metal Ion for Analysis** --- **A. A Set of Standard Solutions** 1. **Prepare a stock solution.** Show the calculation for the mass of metal ion salt in the preparation of the stock solution. Refer to Prelaboratory Assignment, question 2a. Calculation: \[ 100\text{mL} \times 1\text{L} / 1000\text{mL} \times 0.10\text{mol} / 1\text{L} \times 249.68\text{g} = 2.5\text{g } \text{CuSO}_4\cdot\text{5H}_2\text{O} \] - **Measured tared mass of metal ion salt (g):** 2.499 - **Description of the preparation of the 0.10 M stock solution.** - **Concentration of stock solution (mol/L):** 0.01 M --- **B. Determination of \(λ_{max}\)** 2. **Wavelength Scan.** Use the following table to record the wavelength and absorbance data. | λ | Abs | λ | Abs | λ | Abs | λ | Abs | λ | Abs | |------|-----|------|-----|------|-----|------|-----|------|-----| | | | | | | | | | | | - **Plot the data of absorbance versus wavelength to set \(λ_{max}\). From the data plot, \(λ_{max}\):** 610 nm - **Have the instructor approve your graph.** --- **C. Plot the Calibration Curve** 1. **Absorbance of Standard Solutions.** Read and record the absorbance values for the standard solutions. | Standard Solution | Volume of Standard Solution (μL) | Absorbance | Calculated Molar Concentration | |-------------------|-----------------------------------|------------|--------------------------------| | Blank | 0 | 0.033 | | | 1 | 2 | 0.095 | | | 2 | 5 | 0.763 |

The answer for Sodium Phosphate is 15 mMol. I'm not sure how they got this answer?

What volume (in mL) of 18.0 M H2SO4 is needed to contain 2.45 g H2SO4? Answer and state the solutions clearly.

The symbol for molarity is ______. The units of molarity are ______.

3.35 molmol of LiClLiCl in 3.32 LL of solution  calculate the molarity

When finding out the moles of water, why is the denominator of that 18.02? Wouldnt it be the other way around and have the denominator be 1000g?

[Review Topics] [References] The diving atmosphere used by the U.S. Navy in its undersea Sea-Lab experiments consisted of 0.036 mole fraction O2 and 0.056 mole fraction N2, with helium (He) making up the remainder. What are the masses of nitrogen, oxygen, and helium in a 8.58 g sample of this atmosphere? Mass of oxygen Mass of nitrogen g Mass of helium

Please answer it all with solutions

What volume of 0.235 M H2SO4 is required to completely react with 15.0 mL of 0.575 M NaOH? Hint: Start with the balanced equation.

Give 3 uses of calculations of concentrations of solutions on the medical setting