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Troyanec [42]
3 years ago
15

Tari serampang dua belas berasal dari​

Chemistry
1 answer:
Margaret [11]3 years ago
5 0

Berdasarkan sejarahnya, tarian ini lahir dan berkembang di wilayah internal Kesultanan Serdang Bedagai, Deli Sedang, Sumatera Utara. Sebelum menggunakan nama “semudah dua belas”, tarian ini pada awalnya bernama tarian Pulau Sari hasil kreasi orang Melayu asli bernama Sauti pada tahun 1940-an.

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Eating an apple

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How many elements are in N2 and how many atoms are in N2?
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If 21.00 mL of a 0.68 M solution of C6H5NH2 required 6.60 mL of the strong acid to completely neutralize the solution, what was
Andru [333]

Answer:

pH = 2.46

Explanation:

Hello there!

In this case, since this neutralization reaction may be assumed to occur in a 1:1 mole ratio between the base and the strong acid, it is possible to write the following moles and volume-concentrations relationship for the equivalence point:

n_{acid}=n_{base}=n_{salt}

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n_{salt}=0.021L*0.68mol/L=0.01428mol

So we can divide those moles by the total volume (0.021L+0.0066L=0.0276L) to obtain the concentration of the final salt:

[salt]=0.01428mol/0.0276L=0.517M

Now, we need to keep in mind that this is an acidic salt since the base is weak and the acid strong, so the determinant ionization is:

C_6H_5NH_3^++H_2O\rightleftharpoons  C_6H_5NH_2+H_3O^+

Whose equilibrium expression is:

Ka=\frac{[C_6H_5NH_2][H_3O^+]}{C_6H_5NH_3^+}

Now, since the Kb of C6H5NH2 is 4.3 x 10^-10, its Ka is 2.326x10^-5 (Kw/Kb), we can also write:

2.326x10^{-5}=\frac{x^2}{0.517M}

Whereas x is:

x=\sqrt{0.517*2.326x10^{-5}}\\\\x=3.47x10^-3

Which also equals the concentration of hydrogen ions; therefore, the pH at the equivalence point is:

pH=-log(3.47x10^{-3})\\\\pH=2.46

Regards!

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2 years ago
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*blank* carry blood away from the heart, while *blank* carry blood back to the heart.
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i think its C im not so sure

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