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Describe the bonding between sodium and chlorine in NaCl

Sodium donates its outer shell (valence) electron to chlorine, so that both have a full outer shell. Sodium and chlorine are then held together by electrostatic forces of attraction between the positively ch...
SB
Answered by Sarah B. • Chemistry tutor
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Describe the trend in reactivity as you go down group 2 metals?

As you go down group 2, the reactivity increases as the atomic radius increases and the shielding increases. This is despite the increase in nuclear charge. Therefore, as you go down group 2 less energy is r...
CN
Answered by Chioma N. • Chemistry tutor
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A student wishes to determine the concentration of sulfuric acid. They run a titration and discover that 62.5cm^3 is needed to neutralise 20cm^3 of sodium hydroxide of concentration 2moldm^-3. Work out the concentration of the acid.

To answer this question the first thing that needs to be done is to write a chemical equation, making sure it is balanced and includes state symbols:H2SO4 (aq) + 2NaOH (aq) --> Na2SO4 (aq)+ 2H2O (l)Next w...
EC
Answered by Ellen C. • Chemistry tutor
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Describe the similarities and differences between ionic and (simple) covalent bonding?

Similarities Doesn't conduct electricity (only when the ionic is in solid) and covalent always (no charged particles) Many dissolve in water Differences Ionic substances loose or gain and electron to become ...
HL
Answered by Holly L. • Chemistry tutor
2496 Views

In aqueous solution, sulphuric acid dissociates into ions in 2 stages. The pKa for the first dissociation is -3. Calculate the pH of a 0.025 mol dm-3 solution of sulphuric acid using the pKa value of the 1st dissociation.

Ka = 10 -pKa = 10 --3 = 1000[H + ] = √ Ka [0.025] = √1000 x 0.025 = 0.791pH = -log [H] = -log(0.791) = 0.102 = 0.1
OM
Answered by Octavia M. • Chemistry tutor
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