In an experiment for measuring water hardness in a water sample, using Atomic Absorption Spectrophotometry, I obtained a value of 173.74 ppm hardness for my water sample. Using EDTA determination, I obtained a value of 440 ppm hardness for my sample. In both these methods, I was measuring the hardness in relation specifically to Mg and Ca Ions.

Considering the fact that AA Spectrophotometry is a highly accurate method for measuring water hardness, I was wondering if there could be any possible explanations as to why the hardness for water obtained through EDTA determination is greatly larger than AA hardness. I recognize the fact human error is likely whilst carrying out an EDTA determination of a water sample.

Compute the standard error for the three firms : Using the finite population correction factor, compute the standard error for each of the three firms given a sample of size 50. |

Determine which alternative is most likely to impact : determine which alternative is most likely to impact the organization's profitability. This manager is focusing on which criterion for decision-making? |

Confidence level-hypothesis testing : A recent study of the USA births showed the average birth weight of a male was 8 lbs.; the average weight of a female newborn was 7.4 lbs. |

What is the minimum score needed to receive a grade of a : The professor has informed us that 7.93 percent of her students received grades of A. Illustrate what is the minimum score needed to receive a grade of A? |

Analysis of water hardness : In an experiment for measuring water hardness in a water sample, using Atomic Absorption Spectrophotometry, I obtained a value of 173.74 ppm hardness for my water sample. |

Find probability that height is less than sixty five inches : The heights were normally distributed, with a mean of 67.8 inches and a standard deviation of 4.0 inches. A study participant is randomly selected. Find the probability that his height is less than 65 inches. |

Affect the performance of the economy : The federal government employs a budget plan over several fiscal years that results in significant increases in the national debt, with no relief or plans to deal with the problem. |

Are there secure strategies for mcgraw-hill and pearson : In this payoff matrix the first number in each cell is the profit payoff to McGraw-Hill; the second number is the profit payoff to Pearson. Are there secure strategies for McGraw-Hill and Pearson? If so, illustrate what are they? |

Determine the complete wavefunction : What is the complete wavefunction for n=2, L=0, and m(sub L)= 0? What radius of the orbital specified is required to contain 95% probability of finding an electron? |

## Steps in the mechanism for the following reactionShow all the steps in the mechanism for the following reaction, When benzene is mixed with deuterated sulfuric acid, deuterium is slowly incorporated onto the ring. Show the mechanism for this reaction and explain how this relates the sulfonation of .. |

## Prior to placing piece of metal into the graduated cylinderThis assignment inhibits chemistry Laboratory Questions. |

## Chemical and pharmaceutical scienceWrite an equation for the formation of an acetal from reaction of excess methanol with benzaldehyde in the presence of an acid catalyst. |

## What is the structure - stereochemistryWhat is the structure (including functional groups)? Stereochemistry (racemic or single enantiomer)? |

## What will be the resultant pressureWhat will be the resultant pressure when the stopcock is opened? |

## The 1h nmr spectrumIntegrals for some of the resonances in the 1H NMR spectrum are higher than they should be due to the shear number of hydrogens in this compound |

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