1. You are working with a colleague to measure the carbonate chemistry of a set of water samples. Unfortunately your colleague is a bit sloppy, and when you look at the data, you realize there must have been some errors in the measurements. Blank cells in the table below mean your colleague didn't collect data for that species in that sample. For each sample (#1-6), EITHER explain why at least some measurements for that sample must be in error OR fill in the missing data with reasonable values. (Note: you can assume the precision of the measurements is ±1mM, so inconsistencies below that level do not necessarily indicate errors.) Sample pH [H2CO3*] (MM) [HCO3] (mM) [CO3²-] (MM) Total C (mM) 1 12.0 195 199 2 3.1 155 520 3 1000 100 1101 4 7.4 317 317 50 CO 248 248 1675 6 8.3 97 402

2-22. A 6.42% (w/w) Fe(NO,); (241.81 g/mol) solution has a density of 1.059 g/mL. Calculate (a) the molar analytical concentration of Fe(NO3)3 in this solution. (b) the mass in grams of Fe(NO;)3 in each liter of this solution.

2- Suppose a 0.025 M aqueous solution of phosphoric acid (H3PO4) is prepared. Calculate the equilibrium molarity of HPO properties of phosphoric acid in the ALEKS Data resource. Round your answer to 2 significant digits. M 0 X S ? You'll find information on the

Calculate the molarity of a solution that contains 324 grams of KNO3 (molar mass of KNO3 =86 g/mole) in 2.00 liters of solution. Must show calculation setup. T TTT Paragraph v Arial v 3 (12pt) E- T 只i是 O fr Mashups - 曲田国 田图□I HTML CSS

Does it possible to use gravimetric analysis  to quantiify certain parameters as indicators of quality in squash soup? If yes, please explain the process

3-6 3 SOLUTIONS AND NAME SOLUTION CONCENTRATIONS 1415 Section Pre-Lab Assignment Experiment objectives A, B, and C require you to devise procedures for preparing a saturated aqueous solution of potassium sulfate, experimentally determining the density of this solution, and experimentally determining the mass percent of potassium sulfate in this solution. Your pre-lab assignment is to develop procedures for parts A, B, and C. You will then execute these procedures in lab. PREPARATION OF A SATURATED AQUEOUS POTASSIUM SULFATE SOLUTION Reminder: use a maximum of 75 mL of water. A. В. DENSITY OF SATURATED AQUEOUS POTASSIUM SULFATE SOLUTION C. MASS PERCENT OF POTASSIUM SULFATE IN A SATURATED POTASSIUM SULFATE SOLUTION

Average mass of the precipitate MgNH4PO4·6H2O (s) / g Average phosphate concentration in water sample (mass/volume %) % difference of 2 trials

7 Solid lead (II) nitrate is slowly added to 125 mL of a 0.190 M potassium hydroxide solution until the concentration of lead ion is 0.0547 M. The percent of hydroxide ion remaining in solution is %. Submit Answer $ 4 R LLO % 5 [Review Topics) [References Use the References to access important values if needed for this question. Retry Entire Group T Cengage Learning | Cengage Technical Support ^ 6 * 8 more group attempts remaining MacBook Pro G H 2 & 7 A J * 0 8 ( 9 UD U K F 0 ) O ◆ P | Previous Email Instructor { [ + 11 = Next> Save and Exit } ]

can be used as a standard solution for checking the concentration of a solution containing sulphuric acid, 8.7 cm' of sulphuric acid. Find the concentration of the sulphuric acid in both mol dm3 and g dm³. In a particular experiment 10,0 cm³ of a 0.50 mol dm³ solution of sodium ethanedioate was found to react with Q2. Sodium ethanedioate, Na;C¿O4, can be made into a solution of an exact and reliable concentration and so London ndon A.C.1.2

Experiment-A8: Spectrophotometry of Cobalt( Pre-laboratory Exercises 1. (a) Define Beer's law and give the mathematical equation (specify each symbol in the equation). concentration of achemical Solution Beer's Law states that the in the following A = Ebc is directly proportional to its absorption of light & can be calculated formula (b) Briefly explain what Beer's plot is and how do you obtain the Beer's constant (k) from the plot. is a straight line with _ay-intercept Beer's plot of zero & a slope of ab oreb. It represents the absorptunity the length Absorbance 8 can be calculate by multiplying Constant by the path length then dinding that value by the 2. The following solutions are prepared from 0.200 MNICI, and their absorbance measured at 725 nm. Solution # 1 2 3 4 5 Volume (mL) of 0.200 M NiCh 1.00 2.00 3.00 4.00 pride 5.00 Volume (mL) of H₂O 4.00 3.00 2.00 1.00 0.00 INICI] (a) Calculate the molar concentration of NiCl₂ in each solution 1-5. Absorbance at 725 nm 0.105 0.210 0.315…