Only played about 40 hands at the table, villain hasn't played to many hands since I've been here and appears to be pretty passive when in a hand. Is my turn bet a good size? What's my play when villain bets the river?

Starting game 1785627812.

sprungerk is at seat 0 with $12.95.
wan1 is at seat 1 with $58.35.
la_sentencia is at seat 2 with $56.95.
jeth is at seat 3 with $59.50.
Trashcona is at seat 4 with $87.55.
nic-23 is at seat 5 with $61.95.

The dealer is seat 0.

wan1 posts a blind of $.25.
la_sentencia posts a blind of $.50.

(Trashcona is dealt As Kc.)

Pre-flop:
jeth folds.
Trashcona raises $1.50.
nic-23 folds.
sprungerk calls for $2.
wan1 folds.
la_sentencia calls for $1.50.

The flop comes
Ac 8h Kd.

la_sentencia checks.
Trashcona bets $4.
sprungerk folds.
la_sentencia calls for $4.

The turn comes Qh.

la_sentencia checks.
Trashcona bets $10.
la_sentencia calls for $10.

The river comes Qc. (pot =$34.00-rake)

la_sentencia bets $22.50.
Trashcona ??