Question

según la escala, ¿cuál de estas sustancias es el ácido más fuerte?
opciones: sangre, jugo de limón, lejía, naoh (con imagen de escala de ph a la izquierda, nivel educativo 8th, 9/15 preguntas)

Explanation:

To solve this, we analyze the pH (acidity/alkalinity) of each substance:

1. Sangre (Blood): Blood is slightly alkaline (pH ~7.35–7.45), so it is not an acid.
2. Jugo de limón (Lemon juice): Lemon juice contains citric acid, with a pH around 2–3 (acidic).
3. Lejía (Bleach): Bleach (e.g., sodium hypochlorite) is strongly alkaline (pH ~11–13), not an acid.
4. NaOH (Sodium hydroxide): NaOH is a strong base (alkaline), not an acid.

Among the options, only jugo de limón is an acid, and it has the lowest pH (most acidic) compared to the others (which are neutral/alkaline).

Analyze pH of each substance: blood (alkaline), lemon juice (acidic, pH ~2–3), bleach (alkaline), NaOH (base). Lemon juice is the only acid here.

Answer:

jugo de limón