No they do not, darker colors tend to fade at a different rate than the lighter ones
Answer is: pH value of weak acid is 3.15.<span>
Chemical reaction: HA(aq) </span>⇄ A⁻(aq) + H⁺<span>(aq).
c(weak acid) = 0,5 M.
Ka(weak acid) = 1.0</span>·10⁻⁶.
[A⁻] = [H⁺] = x.
[HA] = 0.5 M - x.
Ka = [A⁻]·[H⁺] / [HA].<span>
</span>1.0·10⁻⁶ = x² / (0,5 M - x).
Solve quadratic equation: x = [H⁺] = 0.0007 M.
pH = -log[H⁺].
pH = -log(0.0007 M).
pH = 3.15.
A solution in which water is the solvent
Bonds formed between atoms can be classified as ionic and covalent
Ionic bonds are formed between atoms that have a high difference in the electronegativity values.
In contrast, bonds formed between atoms that have a difference in electronegativity lower than the ionic counterparts are polar covalent bonds. If the atoms have very similar electronegativities, they form non-polar covalent bonds.
In H2S, the S atom is bonded to 2 H atoms. The electronegativity of H = 2.2 and S= 2.56. Since the difference is not high the bond formed will be covalent (polar covalent).
Making repeated separations of the various substances in the pitchblende, Marie and Pierre used the Curie electrometer to identify the most radioactive fractions. They thus discovered that two fractions, one containing mostly bismuth and the other containing mostly barium, were strongly radioactive.
<h3>What was surprising about pitchblende?</h3>
Since it was no longer appropriate to call them “uranic rays,” Marie proposed a new name: “radioactivity.”
Even more surprising, Marie next found that a uranium ore called pitchblende contained two powerfully radioactive new elements: polonium, which she named for her native Poland, and radium.
<h3>Why is radium more radioactive than uranium?</h3>
It is 2.7 million times more radioactive than the same molar amount of natural uranium (mostly uranium-238), due to its proportionally shorter half-life.
Learn more about highly radioactive elements here:
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