does this help?

the formula is (c1)(v1)=(c2)(v2)trying to find/ fill in the answers in the empty boxes

Phosphate Concentration Sample Absorbance at 690 mm (in ppm) Blank 0.00 0.00 Standard Solution 0.02 pm 0.112 Sundand Solution 2 004 pm 0.258 Standard Solution 3 0.08 pon 0.494 Standard Solution 4 0.16 ppm 0.912 Standard Solution 3 0.32 ppm 0.134 Water Sample 1 0.095 Water Sample 2 1) Construct a phosphate standard curve in Excel by plotting concentration (in ppn) on your -axis and Absorbance (unidess) on your y-axis for your known solutions. Label the axes on the graph and provide the curve with a title. Use a linear trendline to generate a best fit line to your data. Label the graph with the equation and the value. Insert your labeled graph in the space below. 2) Using the equation from your graph, determine the phosphate concentration (in ppm) in each of your natural water samples