Eventually using the NaOH and the acid’s consumed moles, the equivalent mass will be determined. Procedure: Part 2: Obtain 45mL of NaOH, and then weigh 0.3-0.4g of the unknown acid (KH2PO4). Dissolve the acid into 20.00mL water. Record the buret readings, and slowly titrate the NaOH into
The line of best fit gives the respiration rate of day-old seedlings as the concentration of NaCl they are exposed to increases. As NaCl Concentration increases the rate of cellular respiration decreases by .108 ppm CO2/g per second. This overall decrease throughout the data further supports our hypothesis. Discusion: The data collected in the experiment does support our hypothesis. By examining the data as a whole a trend of decreased cellular respiration in seedlings soaked in solutions with increased NaCl concentrations.
8. Record the temperature every 30 seconds for a total of 10 minutes. ￼￼￼Chemicals ￼￼￼￼￼￼￼Quantity ￼￼￼￼Sodium chloride powder (NaCl(s)) ￼￼20 g ￼￼￼Water ￼￼￼￼￼￼￼500 ml ￼￼￼Page 5 of 7 9. Repeat steps 4 to 8 for a total of 3 recordings. Making sure that all the apparatus are washed thoroughly before each experiment.
Fifty ml of salt effected the egg float the most, with average height 4 cm. Zero ml of salt effected the egg float the least, with average hight zero cm. Egg floated 0.3 cm in 15 cm of salt. Different amount on salt did effect the hight the egg floats in water. There are no obvious trends or patterns.
8. Balanced chemical equation for the formation of zinc chloride from zinc and HCl First, we set up the equation xZn(s) + yHCl(aq) → ZnxCly (s) + y/2H2(g) . We knew the empirical formula for zinc chloride is ZnCl8. Based on the law of conservation of matter, we got the balanced equation: Balanced equation: Zn(s) + 8 HCl(aq) → ZnCl8 (s) + 4 H2 (g) 9. Percentage Error Calculation: Experimental values: (1.8+4.34)/2= 3.07g (average mass) Accepted values: 2.67g ZnCl8 0.5g Zn x 1mol Zn/65.4g Zn x 1/1 x 349.4g ZnCl8/ 1 ZnCl8 mol = 2.67g ZnCl8 l 3.07g-2.67gl / 2.67 x 100 = 14 % B Copper Sulfide Trial 1 Trial 2 Trial 3 1.Mass of crucible, cover and copper 22.82g 21.04g 22.87g 2.Mass of crucible and cover 20.91g 20.61g 21.49g 3.Mass of
Lab Final Mrs. Hsi/Horne Redmond High School January 6th 2015 Maddi Bibby and Lisa Brinton Abstract The purpose of this lab is to observe the reaction between sodium bicarbonate and calcium chloride take place, determine which of the reactants is the limiting reactant and which is the excess reactant, determine the theoretical mass of the precipitate that should form, and compare the actual mass with the theoretical mass of the precipitate and calculate the percent yield. In the lab, it was determined that Na CO had an average final mass of 7.41g after the three trials were performed. It was found that CaCl had an average final mass of 5.53g from the three trials performed. (Data Table 1) When Na CO was mixed with water, it
3.3.4 Preparation of CaCl2 solution The molecular weight of CaCl2 was 111 g/mole. Weighed 11.1g CaCl2 and dissolved into 100ml distilled water. The final CaCl2 concentration would be 1M. CaCl2 solution was used to make bottom agar and initiate the infection cycle. 3.4 Selection of most sensitive strain to bacteriophages to make new stock culture Starting culture was prepared by inoculating 1ml (1×109 CFU/ml) stock Lactococcus lactis ssp.
Standard stock solutions of NaCl 10 ml were prepared. Standard stock solutions of NaCl of different concentrations were then fed into 5 different vials. The solution sample was directly inserted into the sample vial bottle. Snack samples were pre-prepared prior to analysis. The instrument was calibrated in advance by using distilled water.