i) Write down the equation derived from your Excel generated standard curve and describe its components; ii) provide the values of the absorbance data of the unknown sample (do NOT show the absorbance data of the glycine standards). Show all details of the working out of your calculation. Indicate all units! Provide the answer with two decimals precision iii) state the answer in a full sentence. (note: avoid mathematical symbols [=, +, -, etc] in your answer sentence).

number 57.) what's the answer

Highlight your values of A,B,C and D.  For your question: A mL of B mol/L sodium phosphate solution is combined with C mL of  D mol/L calcium bicarbonate.  (Calcium bicarbonate is soluble.) A       mL B      mol/L C       mL D      mol/L 75.0 ml 0.300 67.5 0.350   Before you begin your reaction, you must accurately produce 1.500 L of your sodium phosphate solution from sodium phosphate trihydrate solid.  Write out a procedure to explain all the steps you will take in the lab when making the solution to ensure that your solution concentration is accurate.  Please include calculations that show the required mass of solid.  Also include the correct names of all equipment used.

6 x 10⁻⁵¹ = (0.15 M)² [S²⁻] [S²⁻] = (6 x 10⁻⁵¹) / (0.15 M)² Calculating, we find the minimum concentration of sulfide ion required: [S²⁻] ≈ 2.7 x 10⁻⁴⁹ M. check it calcution is write

A student needs 240 mL of a 1/20 dilution of an undiluted stock solution. What volume (mL) of the stock solution will be required? Note: Your answer should be in numerical format to the nearest whole number (with a decimal).

Laemmli buffer, also referred to as SDS-reducing buffer, is added to each of the samples. It is a blue solution and the recipe for 2X Laemmli buffer is: 0.125 M Tris HCl, pH 6.8, 20% glycerol, 4% SDS and 10% β-mercaptoethanol (βME). What is the purpose of each of these ingredients?

An order was received for 750 mL of 7.5% dextrose solution using 5% D5W and 20% D20W.  How many parts of each dextrose solution is needed?(round answers to the nearest tenth)

Consider a pH titration curve at 298 K for 50 mL of 0.10 M hypobromous acid, HBrO (Ka = 2.8 x 10−9), titrated with 0.10 M KOH solution. a. What volume of KOH is needed to reach the half-equivalence point? b. Calculate the pH of the HBrO sample at the half-equivalence point. c. Calculate the equivalence point pH.  d. Identify a satisfactory pH indicator for the equivalence point. The pH range of colour change is indicated in parentheses. A) Methyl orange (3.0 - 4.3)  B) Bromocresol purple (5.0 - 6.5)  C) Alizarin yellow R (10.0 - 12.0)  D) Methyl red (4.2 - 6.2)

When 300 mL of 0.0010 M Ca( NO3)2 solution is added exactly to 500 mL of 0.0015 M K3PO4 solution, find the ion product Q and decide whether to precipitate. (However, K_sp of Ca3(PO4)2 = 1.2x 10^-26)

Concentrations in biochemical systems are often very dilute. Consequently, scientific notation and logarithms are often used to express concentrations. In scientific notation, numbers are expressed as coefficient x 10" To convert a number to scientific notation, proceed as follows: 1. Move the decimal place so that there is one digit in front of the decimal. 2. Account for the moved decimal in the value of x. If the decimal moved to the right, x is negative; if it moved to the left, x is positive. A logarithm is basically an exponent. Unless otherwise indicated, a logarithm is the a of 10". The numbers after the decimal point are significant; the number before the decimal just identify the location of the decimal point for the number. Notice that it is easy to estimate a logarithm from scientific notation; it's the exponent! Logarithms are commonly used to express the concentration of H. The pH is defined as pH= log (In), where the base number is 2.303. The same general rules as logs…