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adell [148]
3 years ago
12

How many significant figures are in the measurement 0.003 4 kg

Chemistry
1 answer:
deff fn [24]3 years ago
3 0

Answer:-

4

Explanation:-

In 0.0034 the zeros are preceding numbers and after the decimal point. Hence the zeroes are significant.

Thus there are 4 significant figures in 0.0034.

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Answer:

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Explanation:

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If a buffer solution is 0.220 M in a weak acid ( Ka=7.4×10−5) and 0.540 M in its conjugate base, what is the pH?
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Answer: the pH of the solution is 4.52

Explanation:

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pH = pKa + log( [A⁻] / [HA])

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now the conjugate base of the weak acid HA is

HA(aq) {weak acid}     H⁺(aq)  +  A⁻(aq) {conjugate base}

so now we calculate the value of Kₐ as well as pH value by substituting the values of the concentrations into the equation;

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now thw pH is

pH = pKₐ  + log( [A⁻] / [HA])

pH = 4.13 + log( [0.540] / [0.220])

pH = 4.13 + 0.3899

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3 years ago
Convert -32 F into K
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Ammonia, nh3, is a weak base with a kb = 1.8 x 10-5. in a 0.8m solution of ammonia, which has a higher concentration: ammonia (n
insens350 [35]
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Kb(NH₃) = 1,8·10⁻⁵.
c₀(NH₃) = 0,8 mol/L.
c(NH₄⁺) = c(OH⁻) = x.
c(NH₃) = 0,8 mol/L - x.
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