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It's Brisbane.

Remember  latitude and longitude.

27 degrees south is on the second bottom of the map (cities located beneath the equator). Also, 153 degrees east is located on the eastern side of the prime meridian. When pinpointing the location with these coordinates, you will find Brisbane

the stabilization of the negative charge in orbitals with higher s character

Explanation:

Acetylide anion is a carbon anion compound or popularly called carbanion. Now Acetylide anion is sp hybridized. However acetylide anion tends to be more acidic as we move from sp³ to sp, hence acidicity increases, which makes sp to have the highest acidity and become the most  stable.

So, we can conclude that the acetylide anion is more acidic due to the stabilization of the negative charge in orbitals with higher s character and  as the s character increases, acidic nature of acetylide anion also increases.