Le Chatelier’s Principle Questions In Part I the reaction you observed was Mg(OH)2 (s) → Mg2+ (aq) + 2 OH- (aq). Compare the colors you observed in the experiment and answer these questions: A. Which way should the equilibrium shift when HCl is added? How do your results support your answer? B.
Litmus test: Red turned blue and blue had no reaction Dilute HCl: Fizzes and substance turns yellowish while bubbling the back to white. Dilute NaOH: Dissolves and substance became a bit thick Substance: CuCO3 Color: Green Odor: Yes Effect of Heat: Turned into black powder Solub. or Reaction w/cold H2O: No reaction. Solub. or Reaction w/hot H2O: No reaction Litmus test: No change on blue or red.
Exercise 10: Acid-Base Balance: Activity 3: Renal Responses to Respiratory Acidosis and Respiratory Alkalosis Lab Report Pre-lab Quiz Results You have not completed the Pre-lab Quiz. 07/18/13 page 1 Experiment Results Predict Question: Predict Question 1: What effect do you think lowering the PCO2 will have on [H+ ] and [HCO3- ] in the urine? Your answer : d. [H+ ] will decrease and [HCO3- ] will increase. Predict Question 2: What effect do you think raising the PCO2 will have on [H+ ] and [HCO3- ] in the urine? Your answer : c. [H+ ] will increase and [HCO3- ] will decrease.
These can be removed by adding a solution of potassium iodide, KI. In this investigation, you will combine different pairs of solutions to discover which cation/anion combinations result in the formation of a precipitate. Purpose: To identify which anion could be used to precipitate
Abstract: In this lab, the purpose was to determine the reaction rate for the absorption (concentration) of the reaction. The components needed for the rate law in this lab are the k value as well as determining if the reaction is zero, first, or second order. The graphical method will be used to determine the order as well as the “K” value. The absorption of the green light increased over time as the reaction occurred. Background: A reaction rate is the decrease in concentration of a reactant or the increase in concentration of a product with time.
Therefore, the conductivity will go down. At the equivalence point of solution, the conductivity will be lowest. Data and Analysis: * Molarity of sulfuric acid used : 0.02M * Comcentration of Ba(OH)2 : + method 1: Vol H2SO4 = 10.51 ml = 0.01051(l) Moles of H2SO4 = 0.02 * 0.01051 = 0.0002102 (mol) Moles of [ SO4 -] =0.0002102 mol Moles of [Ba 2+] = 0.0002102 mol Moles of [Ba 2+] = moles of Ba(OH)2 =0.0002102 mol Volume Ba(OH)2 = 0.025 (l) [Ba(OH)2] = 0.0002102 / 0.025 = 0.008408 M + method 2: y= -175.1x +1966 | | y= 143.8x - 1270 | | | | slove : 143.8x - 1270 = -175.1x +1966 | | (143.8+175.1)x = 1966+1270 | | 318.9x = | 3236 | x = | 10.14738 | y= | 189.1932 | Discussion : I think the second method is more accurate. This method was to use a Vernier Drop Counter to take volume readings. H2SO4 titration was delivered drop by drop and reacted with Ba(OH)2 in the beaker.
What is the function of the iodine solution in the Gram stain? If it were omitted, how would staining results be affected? Iodine is used as a mordant, it combines with the dye in the Gram Stain. 2. What is the purpose of the alcohol solution in the Gram stain?
INTRODUCTION AIM: The aim of this investigation is to determine and analyse the effects of temperature and light exposure on Vitamin C concentration of a sample orange juice solution by means of volumetric analysis in conducting colorimetric titration testing. HYPOTHESIS: It is predicted that exposure of juice solutions to elevated temperatures and concentrated ultra-violet light rays, will result in increased levels of degradation of Vitamin-C due to oxidation and thus decreased concentrations of Vitamin-C in comparison to control orange juice solutions unaffected by these independent variables. BACKGROUND INFORMATION: Vitamin C, scientiﬁcally identiﬁed as L-ascorbic acid (information on the enantiomers of ascorbic acid is provided in Appendix ___),is an essential nutrient for normal growth and development of the human body and many animals. It works as a co factor for enzymes essential for synthesis of collagen proteins and also assists the body in the process of healing wound, the maintenance of bones and teeth, and important processes involving ligaments, cartilage, tendons and blood vessels. Vitamin-C is unable to be stored (due to its water solubility) or synthesized by the human body and therefore must be acquired from dietary sources; primarily citrus fruits and vegetables.
NaOH solution would be in excess and thus prepare 1 M of HNO3 solution in burette, which will be used in back-titration. 4. Determine the end point of the back-titration when NaOH solution changes its color into pink. Record the results of at least three titrations. (Make a rough titration first).
2. Explain why denatured sucrase was used as a control. to determine if a true effect was made on the active sucrase by ph, temperature and sucrose or if affect would be seen on both denaturated and active sucrase 3. Alkaline DNS denatures sucrase. Explain why it is important to denature the enzyme.