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Sebanyak 43 gram gips (CaSO 4 .xH 2 O) dipanaskan hingga air kristalnya menguap dan menghasilkan 34 gram CaSO 4 murni. Harga x adalah…. (Ar Ca = 40, S = 32, O = 16, H = 1)

Sebanyak 43 gram gips (CaSO4.xH2O) dipanaskan hingga air kristalnya menguap dan menghasilkan 34 gram CaSO4 murni. Harga x adalah…. (Ar Ca = 40, S = 32, O = 16, H = 1)

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Master Teacher

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Jawaban terverifikasi

Jawaban

diperoleh nilai x = 2 dan rumus gips tersebut adalah CaSO 4 .2H 2 ­O.

diperoleh nilai x = 2 dan rumus gips tersebut adalah CaSO4.2H2­O.

Pembahasan

Massa garam hidrat = 43 gram Massa garam anhidrat = 34 gram Massa air = 43 – 34 = 9 gram Mr CaSO 4 = (1 x Ar Ca) + (1 x Ar S) + (4 x Ar O) = (1 x 40) + (1 x 32) + (4 x 16) = 136 gram/mol Mr air = (2 x Ar H) + (1 x Ar O) = (2 x 1) + (1 x 16) = 18 gram/mol Reaksi pemanasan senyawa hidrat berlangsung sebagai berikut: Sehingga diperoleh nilai x = 2 dan rumus gips tersebut adalah CaSO 4 .2H 2 ­O.

Massa garam hidrat    = 43 gram

Massa garam anhidrat = 34 gram

Massa air                      = 43 – 34 = 9 gram

Mr CaSO4            = (1 x Ar Ca) + (1 x Ar S) + (4 x Ar O)

                             = (1 x 40) + (1 x 32) + (4 x 16)

                             = 136 gram/mol

Mr air                     = (2 x Ar H) + (1 x Ar O)

                             = (2 x 1) + (1 x 16)

                             = 18 gram/mol

Reaksi pemanasan senyawa hidrat berlangsung sebagai berikut:

C a S O subscript 4. x H subscript 2 O rightwards arrow space space space space space space space space space space space space space C a S O subscript 4 space space space space space space space space space space space space space space space space space space space space space plus space space space space space space space space space space x H subscript 2 O 43 g r a m space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space 34 g r a m space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space 9 g r a m space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space fraction numerator 34 g r a m over denominator A r space C a plus A r space S plus 4 space A r space O end fraction space space space space space space space space space space space space space space fraction numerator 9 g r a m over denominator 2 A r space H plus A r space space O end fraction space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space fraction numerator 34 g r a m over denominator 136 end fraction space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space fraction numerator 9 g r a m over denominator 18 end fraction space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space 0 comma 25 space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space 0 comma 5 space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space 1 space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space 2

Sehingga diperoleh nilai x = 2 dan rumus gips tersebut adalah CaSO4.2H2­O.

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Senyawa H 2 ​ C 2 ​ O 4 ​ ⋅ xH 2 ​ O sebanyak 12,6 gram dipanaskan dan beratnya berkurang 3,6 gram. Rumus hidrat tersebutadalah.… (Ar, C=32, O=16, H=1)

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