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- ICE (SOs] = | M CH20] = 2 M • Construct (CE Table Given: %3D Find ko. SO3 6) + H,0 c9) ラH2SO4 ca)9. The method described in Problem 5-8 is to be used for the analysis of ores that assay about 1.2% gold. What minimum sample mass should be taken if the relative error resulting from a 0.4-mg loss is not to exceed(a) -0.1%? (b) -0.4%? (c) -0.8%? (d) -1.1%? Here is the number 5-8 5. Describe at least three ways in which a systematic error might occur while using a pipet to transfer a known volume of liquid.6. How are systematic method errors detected?7. What kind of systematic errors are detected by varying the sample size?8. A method of analysis yields masses of gold that are low by 0.4 mg. Calculate the percent relative error caused by this result if the mass of gold in the sample isa. 500 mg. b. 50 mg. c. 150 mg.d. 70 mg.Rewrite the number 3.123 56 (+0.167 89%) in the forms (a) number (6absolute uncertainty) and (b) number (+percent relative uncertainty) with an appropriate number of digits.
- Example 2: You prepared a 0.250 M NH3 solution by diluting 8.45 (±0.04) mL of 28.0 (±0.5) wt% NH3 [density = 0.899 (±0.003) g/mL] up to 500.0 (±0.2) mL. Find the uncertainty in 0.250 M. The molecular mass of NH3, 17.0306 g/mol, has negligible uncertainty relative to other uncertainties in this problem. %3DTitration purity NxVx mEq weight weight of sample (g) x 100 Volume (Weight of sample (g) Nx mEw Weight V = 100 Normality Weight of sample (g) Vx mEw Weight N = 100 mEq Weight mEq Weight % x Weight of sample (g) V xN /100 Weight of sample Nx Vx mEq weight (9)= x 100 %3D % Purity Volume 2 Normality 1 Normality 2 Volume 1SrCl, Observations B|I|U X X + fx | ®| D e Normal Activated charcoal observations Normal BIU fx| 田=| || 的|| || In 1. Based on your understanding of color's relationship to wavelength, identify the approximate wavelength of light (nm) emitted by strontium when it was burned. (No quantitative data was collected for this; you are giving an approximate value only, based on what you observed.) Explain your reasoning in full, making sure to cite specific data and observations to support your answer. Normal BIIIU X:| X'|- EE = fx| DI e 2. While boiling potatoes for dinner in salted water, the pot boils over and you notice that the flame on your gas burner turns to bright yellow-orange. How would you explain the appearance of a color in the previously blue flame? Normal BIIU X X + 田=|IT| 3. What would you conclude about chloride based on your results in the flame tests? Xe | X° | → EI fx| fr DI e E E IT E IT Normal BIIU 4. Place the metal solutions you tested in order of increasing energy…
- How many replicate measurements are needed to decrease the 95 and 99% confidence limits for the analysis de- scribed in Problem 7-7 to + 2.2 ug Fe/ml?Sample IdentificationCodeConcentration of M%TA=2-log(%T)Q50004.00 x 10-417.90.75Q50013.20 x 10-425.00.6Q50022.40 x 10-435.70.46Q50031.60 x 10-450.20.3Q50048.000 x 10-570.80.15SampleIdentificationCode%TA=2-log(%T)AMQ0210150143.70.359518560.360.000192Q0210150244.10.355561410.360.00018Q0210150343.80.358525890.360.00017Q0210150444.10.355561410.360.00018Q0210150543.80.358525890.360.00017What was their percent error?43%Does Batch 021015 meet legal requirements?No, because it is not between 2.85 * 10(4) and 3.15 * 10(4)Well #DropsBluedye1234567891012345678910Drops 9Distilled water876543210Concne 0.26tration0.52Test Tube #0.781.041.3Solutions3Concentration (M)2.082.32.6Concentration (ppm)1:1 dilution11.82Starting Dilution21.562:1 dilution0A.Zero standard0Was your calibration curve as linear as you expected?B.Did you experience any “drift†of the resistance readings?C.What is the equation of your best-fit line?D.What commercial drink did you analyze?E.Assuming…Does the data set of 155.8, 158.4, 194.9, 164.8, 154.5, 184.3, 114.8 and 157.8 ppm contain outlier(s)? (Given that Qcrit.90 % confidence interval (n = 8) D 0.468) %3D %3D O All data should be retained O It is difficult to judge O Both 114.8 and 194.9 ppm are outliers O 114.8 ppm is the outlier O 194.9 ppm is the outlier
