Analytical Chemistry

Analytical Chemistry

c. (.(2'" #

d. (.(38" #

1. Which of the following precipitate are hardest to filter? b. gelatinous a. isomorphous c. crystalline d. curdy precipitates precipitates

8. 5ri- scale is the hydrometer scale for6 b. sugar solution a. gasoline c. li7u li7uef efie ied d prop propan anee gas gas d. wate water  r 

2.What is the color of methyl orange at ph = 8? a. red b. yellow c. colorless d. blue

4. A (.(1(  wea9 acid is .1! ioni:ed. What is the ioni:ation constant?  b.3." - 1(' a.1.4 ! 10"#  c. 1.2 - 1( d. 1.2 - 1('

3. Which of the following conditions would induce  precipitation?  precipitation? a. high temperat temperature ure b. dilute dilute solns solns d. all of the above c. low ph

1(. What is the most commonly used reagent in the standardi:ation standardi:ation of acids? a.  2%&  b. 5orad. $a2%&' c. 5aCl2

. What is the density of !.1"# $ 2%& which is '(.11 ) *w+w,? a. 1. g+l b. !. g+l c. 1.4 g/ml d. !.1 - 1(  g+l

11. What is the practical method of coagulation? a. increasing (  b. agitating+stirring agitating+stirring c. digestion d. all of the aboe

'. Which of the following has the highest purity? a. primary Std. b. /%0 reagent c. AC% reagent d. C0 reagent

12. A (.(!22 # acid has p$ of 3.11; what is the  a of the acid? b.8.'# ! 10") a. .2 - 1(" ! c. 8.3' - 1( d. .2 - 1(!

". What is the color of litmus paper in acid? b. red a. blue c. orange d. colorless

13. What weight. in grams of #n& needed to form a 2'( ml solution of (.1( #? a. !.' b. 2.!' c. '.*# d. 84.'

!. Calculate the molar analytical concentration of solute when 2.' gram of $ *& 3,2 is dissoled and diluted to '(( ml. *#W $ *& 3,2 = 34( g+mol, a. (.(("1 (.(("1 # b. 0.01282 M

1. n a redo- reaction; you need6

a. a strong &A < WA  b. a strong A < a wea9 &A c. a strong &+ , a strong -+ d. a wea9 &A < wea9 A 1'. %i-teen grams of a mi-ture of sodium < potassium is neutrali:ed with ( moles of $ 2%&. $ow many grams of potassium is present in the mi-ture? a. '.(1 g b. 2.43 g c.10.*) g d. '.( g 1". >wenty milliliter of a (.12' # $Cl is mi-ed with 2' m of (.12( # @$3. What is the resulting p$ of the mi-ture? b. 1.2) a. (.('' c. !.'2 d. 8.'( 1!. What is the color of phenolphthalein at  p$ = 1(? a. colorless b. blue d. yellow c. red 18. What is the color of 5romcresol green at  p$ = 4? a. colorless b. yellow c. red d. blue types 14. Which of the following types of precipitimetry is used as a direct method for halide determination? a. Mohr method  b. olhard method c. aBans method d. none of the aboe 2(. What is the titrant used in #ohr method?

a. +g$&' c.  e * C@,"

 b. %C@ d. C@

21. What is the indicator used in aBans method of  precipitimetry? a. methylorange b. phenolputhalein d. Sodium fluoresclinate c. 5romcresol green 22. A certain solution is 9nown to contain a compatible combination of two of the following substance6 $Cl; @a 2$0&; $30&; @a&$; @a30&. >itration of a sample with (.'1( @ $Cl; using methyl orange; re7uires 28.1 m of the acid. With the mass of the sample < phenolphthalein indicator; 1!.1 m of the $Cl is re7uired. What components are present < how many grams of each are in the sple ta9en? a. @a$20& = (.32 g; @a&$ = (.1! g b. @a&$ = (.'1 g; @a$20& = (.!1 g c. $a'&4  0.*21 g $a&  0.12 g d. $Cl = (.' g; $30& = (.14 g