Anachem

• Analyte


  Component of a sample that is of interest to the chemist, usually taken as a representative of a bigger sample
• In preparing a solution of known concentration, mixing the solute with enough water then diluting it to the mark in a volumetric flask is a standard method. What is the reason behind the inversion of the volumetric flask for a number of times in this task?

  
  

  
  

  A) To ensure equilibrium

  B) To ensure even mixing

  C) To get rid of Bubbles in the solution

  D) To get allow absorption and desorption mechanism to work
• Analytical Chemistry


  Branch of chemistry that deals on the analysis, techniques of instrumentation and data interpretation of experimental results
• ACS grade


  Chemical classification that can be used for general procedures that require stringent quality specifications and a purity of ≥95%
• Semi-microanalytical balance


  Balances that have a maximum loading of 10 to 30 g with a precision of 60.01mg
• Spectrophotometer


  Apparatus that gives a numerical data related to the absorbance of a chemical specie along with its color and gives chemical analysts a means to calculate its concentration
• Factors in the environment that causes exposure to the emission of electromagnetic waves

  • Radiation
• Molar Equilibrium concentration


  Molar concentration of a particular species in a solution at equilibrium
• which says 65% colchicine (w/v) in 1000 mL mixture?

  For every 1000 mL of the mixture, there exists 650g of the active ingredient
• Replicates


  Samples of about the same size that are carried through an analysis in exactly the same way
• Structural formula


  Chemical formula best used for isomers such as butane and isobutane
• Does not point of procurement of an assay

  
  

  A) A certain type of grass is collected from a forest, and was analyzed for its overall mercury (Hg) content in its roots

  B) A blood sample was taken from a dead dolphin for a complete genome sequencing

  c) human saliva is collected for the testing of covid-19 genome

  D) A sample of urine was collected from a suspected drunk driver for analysis of phenolic compounds
• Jet is an undergraduate chemistry student, he's out in the laboratory trying to determine the volatile organic compounds as well as over all protein content of the leaf and stem of malunggay (Moringa oleifera). He subjected the leaf and stem in a separate digestion reaction (treatment of sulfuric acid), afterwards he subjected the products to high temperature induction to get dry ash like substances which type Chemical analysis employed by Jetto reach his objective?

  I. Qualitative analysis

  
  

  
  

  1. Qualitative Analysis

  2. Quantitative Analysis

  3. Wet Chemical Analysis
• Interferents


  Outliers of data that may interact with the analyte, altering its response during actual measurement
• Reason for washing inner sections of glassware

  To ensure that any foreign substance inside the glassware is washed away first
• Chemical Standard Materials


  Materials that contain a precisely known concentration of a substance typically used in quantitative analysis
• Reason for cooling heated objects before weighing

  To allow it to get to the room temperature and avoid buoyant effects on the pan
• Chelating agent


  Substance like silver diethyldithiocarbamate that forms a colored solution when it binds with arsenic
• Determining the Validity


  Important analytical method that include analysis of standard reference materials when available, analysis by a different analytical method, analysis of "spiked" samples, and analysis of synthetic samples approximating the chemical composition of the test samples
• Personal protective equipment


  Least effective control measure when it comes to minimizing danger in laboratory experimentation practice
• Desiccator


  Apparatus that should be used to allow slow cooling of samples after heating to avoid weighing errors
• Burette


  Apparatus that will give the most precise measurement up to two decimals places when measuring the volume of a liquid
• Feedback system


  Process of continuous measurement as well as setting up control methods for the improvement of data to ensure correct interpretation
• Vacuum filtration technique

  1. Using the materials: Erlenmeyer flask with arm, rubber tube, vacuum filter, crucible funnel, and Ash less filter paper

  2. Ensure the filter paper is filled and properly placed in the funnel, by putting some water on it

  3. Carefully place the fine solid sample mixed in a reaction to the vacuum filtration slowly

  4. Check if the liquid can freely pass through the filter paper
• Preparing 800-mL of 0.57 M Pb2+ from solid Pb3(PO4)2

  1. Weigh 120g of solid Pb3(PO4)2

  2. Mix it with enough water and dilute to 800 mL
• Preparation of 750mL of 6.00M H3PO4 from 86% H3PO4 (w/w) commercial reagent with specific gravity of 1.71

  Mix 394g H3PO4 with the commercial reagent and dilute to 750 mL