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How many grams of KCl are needed to prepare 125 mL of a 0.720 M KCl solution?
The answer is 6,71 g dried KCl.
How do you prepare 1 L of 15 M sodium hydroxide solution by diluting the stock solution of 6 M sodium hydroxide?
impossible....u want to use a low contrated solution to dilute into a higher contration solution? No way man,...
How about prepare a solution of a 0.1N acetate buffer?
The following table is extracted from the Internet:* For pH=3: mix 982,3 mL 0,1 M acetic acid with 17,7 mL 0,1 M sodium acetate* For pH=4: mix 847,0 mL 0,1 M acetic acid with 153 mL 0,1 M sodium acetate* For pH=5: mix 357 mL 0,1 M acetic acid with 643 mL 0,1 M sodium acetate* For pH=3: mix 52,2 mL 0,1 M acetic acid with 947,8 mL 0,1 M sodium acetate
How many grams of sodium-24 will remain at the end of 4 half-lives?
Suppose you start with 1000 g of sodium-24 . t = 0.0 m = 1000 g t = 1 half-life m = 500 g t = 2 half-lives m = 250 g t = 3 half-lives m = 125 g t = 4 half-lives m = 62.5 g
How do you make 0.2M citrate buffers for pH 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 and 7?
------Headings-------- pH Total conc. (M) Conjugate Base Conc. Conjugate Acid Conc. Conjugate Base Conjugate Acid -------------------------- 1.0 0.2 0.00141 0.19859 Dihydrogen Citrate Citric Acid 1.5 0.2 0.00438 0.19562 Dihydrogen Citrate Citric Acid 2.0 0.2 0.01322 0.18678 Dihydrogen Citrate Citric Acid 2.5 0.2 0.03658 0.16342 Dihydrogen Citrate Citric Acid 3.0 0.2 0.08290 0.11710 Dihydrogen Citrate Citric Acid 3.5 0.2 0.13825 0.06175 Dihydrogen Citrate Citric Acid 4.0 0.2 0.02903 0.17097 Hydrogen Citrate Dihydrogen Citrate 4.5 0.2 0.06988 0.13012 Hydrogen Citrate Dihydrogen Citrate 5.0 0.2 0.12588 0.07412 Hydrogen Citrate Dihydrogen Citrate 5.5 0.2 0.16860 0.03140 Hydrogen Citrate Dihydrogen Citrate 6.0 0.2 0.05695 0.14305 Citrate Hydrogen Citrate 6.5 0.2 0.11146 0.08854 Citrate Hydrogen Citrate 7.0 0.2 0.15985 0.04015 Citrate Hydrogen Citrate Since citric acid has three pKa's (3.15, 4.77, 6.40), , the one closest to each desired pH should be used to make the buffer. For example, if a pH 4.9 buffer is desired, the second pKa should be used and the conjugate acid/base pair for this pKa is dihydrogen citrate and hydrogen citrate. Each of these conjugate acid/base concentrations can be multiplied by the overall volume desired to get the desired volume. However, if not all four compounds are readily available (which is quite common), each one can be generated with acid/base chemistry. For example, if only 1.0 M citric acid is available and 100 ml of 0.2 M pH 7.0 buffer is required, 0.2*0.100/1.0 = 0.02 L or 20 ml of citric acid should be used and (0.15985*3+0.04015*2) *0.100/1.0= 0.055985 L or 55.985 ml of 1.0 NaOH should be added to the citric acid to make the required amount of citrate and hydrogen citrate. This makes up for 75.985 ml and the rest 24.015 ml should be topped up with distilled water.
Preparation of 0 38 M sodium acetate solution?
how will you prepare 0.38M sodium acetate solution
What mass of sodium chloride will be required to prepare 100 cm3 of 0.0282 M of sodium chloride?
The answer is 0,1648 g NaCl.
Is Morganella morganii positive for a citrate test?
M. Morganii is citrate negative
What is the mass of sodium hudroxide needed to prepare 100 mL of a 0.10 M solution?
1.17 grams :)
How many grams of KCl are needed to prepare 125 mL of a 0.720 M KCl solution?
The answer is 6,71 g dried KCl.
How do you prepare 1 L of 15 M sodium hydroxide solution by diluting the stock solution of 6 M sodium hydroxide?
impossible....u want to use a low contrated solution to dilute into a higher contration solution? No way man,...
How do you prepare 1000 ml 0.01 M sodium sulphate?
Dissolve 1,42 g of anhydrous, for analysis sodium sulfate in 1 L demineralized water at 20 oC, in a volumetric flask.
How do you express 125 m in two significant figures?
125 m in two significant figures is: 120 m
How about prepare a solution of a 0.1N acetate buffer?
The following table is extracted from the Internet:* For pH=3: mix 982,3 mL 0,1 M acetic acid with 17,7 mL 0,1 M sodium acetate* For pH=4: mix 847,0 mL 0,1 M acetic acid with 153 mL 0,1 M sodium acetate* For pH=5: mix 357 mL 0,1 M acetic acid with 643 mL 0,1 M sodium acetate* For pH=3: mix 52,2 mL 0,1 M acetic acid with 947,8 mL 0,1 M sodium acetate
How do you prepare a primary standard solution of 0.0500 M sodium carbonate?
use the equation that is standard: 1000 ml 1 M solution= (MOLECULAR WEIGHT) X ml 0.05 M solution = ((MOLECULAR WEIGHT)*X*0.05)/1000
How many grams of solute are needed to prepare 250.0ml of 0.125 M CuSO4?
M means mol/litre, you have 250ml. so divide .125 by 1000, x250 to get the moles. then multiply by molecular weight of copper sulphate
How do you convert 125 m to ft?
1m= 3.28084 ft. So multiply 3.28084 by 125 to get 410.105ft Direct Conversion Formula 125 m* 1 ft 0.3048 m = 410.1049869 ft
