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Borax in water gives B(4)O(7)^(2-)+7H(...

Borax in water gives
`B_(4)O_(7)^(2-)+7H_(2)O rarr 4H_(3)BO_(3)+2OH^(-)`
How many grams of Borax `(Na_(2)B_(4)O_(7). 10H_(2)O)` are required to prepare 50 ml of 0.2 M solution.

A

(a)0.32 g

B

(b)3.82 g

C

(c )0.28 g

D

(d)None of these

Text Solution

Verified by Experts

The correct Answer is:
b
The n-factor or valency factor of borax in the above reaction is 2
Meq. Of borax in 50 ml solution `=50xx0.2xx2=20`
Let weight of borax required =W
`W/382xx2xx1000=20`
`:. W_((Na_(2)B_(4)O_(7). 10H_(2)O))=3.82`
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Borax in water gives the following: B_4O_7^(2-)+7H_2Oto4H_2BO_3+2overset(ɵ)(O)H How many grams of borax (Na_2B_4O_7.10H_2O) are required to (a). Prepare 50 " mL of " 0.2 M solutionl. (b). Neutralise 25 " mL of " 0.2 M H_2SO_4 (Mw of borax =382 )

How many grams of borax (Na_2B_4O_7.10H_2O) are required to neutralise 25 " mL of " 0.2 M HCl and H_2SO_4 separately?

Knowledge Check

  • Na_(2)b_(4)O_(7)10H_(2)O is

    A
    Borax
    B
    Kernite
    C
    Glauber salt
    D
    Colemanite

  • Na_(2)B_(4)O_(7).10H_(2)O is correctly represented as

    A
    `2NaBO_(2).Na_(2)B_(2)O_(2).10H_(2) O`
    B
    `Na_(2)[B_(4)O_(5)(OH)_(4)].8H_(2)O`
    C
    `Na_(2)[B_(4)(H_(2)O)_(4)O_(7)]. 6H_(2) O`
    D
    All of the above

  • Na_(2)B_(4)O_(7).10H_(2)O is correctly represent by

    A
    `2NaBO_(2).Na_(2)B_(2)O_(3).10H_(2)O`
    B
    `Na_(2)[B_(4)O_(5)(OH)_(4)].8H_(2)O`
    C
    `Na_(2)[B_(4)(H_(2)O)_(4)O_(7)].6H_(2)O`
    D
    None of these

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    In borax (Na_(2)B_(4)O_(7).10H_(2)O) how many B-O-B bonds are present?

    What is the correct strctural formula of borax (Na_(2)B_(4)O_(7).10H_(2)O)

    The mass of oxalic acid crystals (H_(2)C_(2)O_(4).2H_(2)O) required to prepare 50 mL of a 0.2 N solution is:

    In borax (Na_(2)B_(4)O_(7).10H_(2)O) the number of B-OH bonds present is :

    Structure of Na_(2)B_(4)O_(7).10H_(2)O contains ---

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