IB Chemistry-Topic 18 (Ka from pH and concentration)

IB Chemistry-Calculating Ka from pH and concentration of a weak acid.
At 5:53 the answer includes units of concentration and you might ask why include units here when its not included in Kc but units can be included for Ka and in IB past exam questions you will see Ka given the units of mol/dm3. HL Paper 1 TZ 1 from May 2010 shows this in question 28

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At 5:53 the answer includes units of concentration and you might ask why include units here when its not included in Kc but units can be included for Ka and in IB past exam questions you will see Ka given the units of mol/dm3. HL Paper 1 TZ 1 from May 2010 shows this in question 28.